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Hunter I-20 Rotor with Check Valve 4" | I20-04

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Hunter I20-04 4 in. Pop-Up Adjustable Arc Rotor

  • Hunter Rotor with Check Valve (I20-04)
  • Series: I20
  • Pop-Up Height: 4 Inches

With 34 nozzle choices, a 17' to 46' radius, and 6 body choices, the I-20 is an indispensable rotor. Whether you've got a small area, sandy soil, or a mix of shrubs and grass, the I-20 is ready to water with efficiency and reliability. Recent improvements include automatic arc return; non-reversing 360, from 50 to 360 degrees; and a non-strippable, vandal-proof drive mechanism that prevents gear stripping and saves repair costs. Adding FloStop control, easy through-the-top arc adjustment, and a standard drain-check valve all equate to a rotor that stands second-to-none in its class.

Features & Benefits

  • Arc setting: 50 to 360 degrees
  • Factory installed rubber cover
  • Through-the-top arc adjustment
  • Quick check arc mechanism
  • Water lubricated gear-drive
  • Nozzle choices: 34

Product Details

  • Models: Shrub, 4", 6", 12"
  • Models stainless riser: 4", 6"
  • Nozzle racks: 1.5 to 8.0 Blue, 2.0 to 4.5 Low Angle Gray, 0.50 to 3.0 Short Radius Black, 6.0 to 13.0 Green, MPR-25, MPR-30, MPR-35
  • Warranty period: 5 years
Product Tag:
Top of the Line
Flow Rate:
0.36 - 14.8 GPM
Spray Pattern:
50 - 360
Spray Radius (ft.):
17 - 46
Check Valve SAM:
Check Valve
Residential And Commercial
Pressure Range (PSI):
Body Height:
Inlet Size:
5 Years
Product Type:
Pop-Up Height:
Check Valve:
Check Valve
Advance Features:
Check Valve, Flow Shut-Off
Riser Material:
Radius (ft.):
17' - 46'
Part Circle Adjustable (50 - 360)
4.5 / 5.0
46 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I wil continue using Sprinklerwarehouse!
This product is the best for most needs
August 18, 2014
Great Sprinkler !
I have 65 of the Hunter I20-04 4 in. Pop-Up Adjustable Arc Rotor sprinklers in my system. The system was installed 10 years ago and I have only had to replace two sprinklers during that time. I expect to be replacing more in the coming years, and purchased 12 sprinklers, which should last me the next 10 years. These units are very easy to replace and adjust.
June 12, 2017
over 3 years ago
Great sprinkler
I have over 4 acres of land, all of it irrigated using this sprinkler. That amounts to well over 200 sprinklers.I installed mine about 7 years ago. It is reliable and has some really good features like being able to turn off individual sprinklers, being able to change the arc without digging up the sprinkler, and a wide variety of nozzles including low angle ones to get coverage under trees. I highly recommend these.
April 27, 2018
over 2 years ago
Only complaint is the advertised distance is a solid stream it doesn't cover that much area
August 14, 2018
over 2 years ago
As advertised
I have purchased this type of sprinkler before and it works well. Price is very reasonable and easy to install.
August 14, 2017
over 3 years ago
Hunter I 20 heads
I have been very satisfied with the Hunter I20-04 heads. I replaced my 30+
year old Rainbird mini paw impulse sprinklers,they seemed to be a constant
maintenance issue would work fine and just stick for no reseason. Some
heads worked fine but would not reverse. Seemed like every couple of weeks
I had to service a head or two. Checked with several people and was told by
all to go with rotors. So I investigated several brands and models and I
thought that the hunter I20-04 was the best for me. Many features were
standard on this head that were optional on others. Well pleased.
July 11, 2018
over 2 years ago
Great product . I do recommend it . Would buy it again in the future. Also the service is excellent , I'm very satisfied with it . The product was delivered on time and works perfectly.
June 6, 2017
over 3 years ago
Lawn pro
Great product very reliable even in sandy soils. Great for commercial or residential lawns.
June 27, 2015
love the I20
Best head made, what else can I say -- other than this is the best price I've seen.
June 30, 2015
over 5 years ago
top notch
You could get a standard Hunter PGP at a big box store for 30 cents more or you could get an I20 with nozzles galore, check valve and 5 year warranty. These are superb sprinkler heads for the price.
June 24, 2017
over 3 years ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 29 questions Browse 29 questions and 119 answers
Why did you choose this?
SprinklerWarehouse.com Store
Past history
William N on Feb 11, 2019
Quality rotor
Steven M on Nov 25, 2018
Past history
William N on Feb 11, 2019
good product
Jerry K on Dec 2, 2018
Quality rotor
Steven M on Nov 25, 2018
Good quality. Standardized design.
A N on Sep 9, 2018
great great quality item
B W on Aug 27, 2018
Replace existing failing toro sprinkler heads, good reviews for hunter. Good price
Randall N on Aug 4, 2018
replace old
J O on Jul 28, 2018
currently have them
J E on Jul 24, 2018
I have a broken one . . .
M O on Jul 21, 2018
Replacements for Hunter I20-04 4" pop-up adjustable arc rotor
Jonathan L on Jul 20, 2018
check valve feature
Daniel M on Jul 19, 2018
ralph i on Jul 16, 2018
Higher quality than Hunter PGP rotor.
J O on Jul 13, 2018
That's the one I use almost all the time.
R A on Jul 10, 2018
Great head. Long lasting.
John C on Jul 9, 2018
purchased in theist and satisfied with product
M A on Jul 7, 2018
This is the existing type of sprinkler rotor in my lawn. This is for replacements.
Paul S on Jul 6, 2018
Jeffrey B on Jul 6, 2018
Model I currently have
H L on Jul 5, 2018
My irrigation system was installed with Hunter heads and several need replacement.
Tom Y on Jun 27, 2018
Recommended from friend
S D on Jun 27, 2018
this is what I have installed already
E E on Jun 24, 2018
Check valve and water shut off.
S H on Jun 19, 2018
Baseball Field replacement heads
Brad C on Jun 17, 2018
For baseball field replacement heads. Thank you!
Brad C on Jun 11, 2018
matches what I have
E X on Jun 6, 2018
Sprinkler Warehouse had by far the best price on this specific rotor.
J O on Jun 3, 2018
I20 offers higher level than pgp and includes flow control (at head shutoff)
J B on May 31, 2018
great price, well recommended rotor
S H on May 30, 2018
To replace I20-04 SS model for residential use
A L on May 29, 2018
one of the best onesmade
B W on May 28, 2018
Replacement of existing
L Y on May 26, 2018
Good product
David R on May 25, 2018
Replace 17 year old heads that have worn out in existing landscape system.
A T on May 13, 2018
Replacing damaged one in me existing system
D O on May 9, 2018
I've had Hunter I20 rotor sprinklers in my yard for 10 years now.....easy to adjust and install but like everything else, some of them tend to wear out over time.
Ben P on May 8, 2018
have used it before
David S on May 8, 2018
It's the only rotor I ever use. Why change what works?
Timothy S on May 7, 2018
They included the adjustment wrench with the product I ordered. Nice.
J M on May 5, 2018
Best value for the dollar, in my opinion. I've tried many different rotors over the years.
Doug U on May 5, 2018
I am replacing existing sprinkler heads.
B J on Apr 21, 2018
It is the sprinkler I prefer for the price. It has all the options I like, and they last a decent amount of time.
Jim M on Apr 6, 2018
Step up from the PGP's. They do cost a little more but well worth it especially when talking about longevity. These are a more commercial grade head and more durable. They are longer in length than the PGP.
John L on Apr 3, 2018
already using this style
Mark V on Mar 25, 2018
I have a Hunter system and this a replacement part I need.
K E on Dec 13, 2017
I am buying for a small park. This seems to be commercial quality.
James K on Oct 17, 2017
bought them before.
Linwood C on Oct 10, 2017
Like the quality of Hunter
R K on Oct 9, 2017
replace damage rotors
John B on Sep 29, 2017
same as what I am using
T A on Sep 29, 2017
good product
Jerry K on Dec 2, 2018
Good quality. Standardized design.
A N on Sep 9, 2018
For regular backyard irrigation do I need the I-20 Ultra 04 sprinkler head or the 1-20 Ultra 06 sprinkler head for its longer height?
A shopper on Apr 28, 2012
BEST ANSWER: I have installed Hunter products for many years. The 4 inch rotor is pretty much the standard. Six inches if you have obstacles to overcome in height, or if you allow your grass to grow abnormally tall. To get the correct depth, use any flat piece of wood approx. 2 or 3 feet long and lay it across the top of the rotor head and push down on it while it is in the soft soil surrounding it. Do it again at 90 degrees. This will give you a good set in height. You can also use a round bubble level on top of the head to get you fairly plumb. After you pack it in place, turn the water adjujstment off at the head, turn on the water pressure and allow the head to pop up. Now you can further adjust it for plumb. Pack the soil around the rotor body. Dress around it with a little top soil and some grass seed, turn the water adjustment to full on at the rotor head and you should be good to go.
ROBERT K on May 19, 2015
BEST ANSWER: The rotor comes with standard nozzles but not the short radius nozzles. You have to determine if you need those and order them when you order the rotors. There is an included tool for arc and radius adjustments. There is another tool that you can purchase separately from Hunter that holds the rotor up when inserting the nozzle. It makes it a lot easier instead of trying to grip the spring loaded rotor while you put in the nozzle.
Does model # 120-4 4in have turn off feature?
A shopper on May 31, 2017
BEST ANSWER: Yes. It is one of the reasons I like this model. It's located on the top of the head and requires a Hunter plastic adjustment wrench, which is very inexpensive. Download the I-20 Spec Sheet for the exact details.
is this the same as the Hunter I-20 Ultra 4 inch Adjustable Rotor ?
NIRAJ K on Jun 26, 2011
BEST ANSWER: Yes, I beleive it is. I have been purchasing the I-20 for several years to replace heads that have became damaged in my yard. the names have changed over the years, but the head remaining the same.

Rick H
What Rainbird head is equivalent to the Hunter I20-04?
Judd M on Aug 29, 2015
I installed and returned some Orbit Voyagers because they leaked from the riser and the nozzzle areas. A turf pro told me that all rotor leak. Does either the PGP or I20 have a similar problem?
A shopper on Sep 30, 2012
BEST ANSWER: We had a large irrigation system (75 heads) installed about 9 years ago and they used the PGP rotors. The originals rotors lasted about 5 years before they started leaking from the risers and I replaced them with PGP again. The newer one did not last as long some only 1 year before they started leaking from the risers again. After comparing old PGP versus new PGP, there was a difference in quality. The old were made better. About 2 years ago I started using the I20's. I like the construction, nozzle insert design and that one rotor to handle adjustable or 360 better but it is to early to tell how long they will last.
what is the height of the sprinkler body -- I want to figure how deep to dig the ditch?
gp on Apr 25, 2014
BEST ANSWER: The I20-04 4" head is 7 3/8" in height. You need to add the riser and T connection height to determine the ditch depth. The best way to do this is to assemble a head on the riser and T assembly you will be using. Measure from bottom of the T to top of the head for ditch depth.

There are a number of instructional and specification PDFs available on the Hunter website, but it won't allow me to post a URL link. Replace DOT with a period (.).

do you have a single stream MP rotor that pops up 4 inches with a 3/4 inlet connection to existing water line? I need it with at least 90 degree arc.
Bruce C on May 1, 2018
BEST ANSWER: Yes, the I-20. It is adjustable from 0-360 degrees. I have used them for two years, no problems except carelessness with the lawnmower. I also have PGJs, they are not as robust, and have minimum arc of 40 degrees and half inch inlet. If you have the room for 12 inches or more depth the I-20 is a more satisfactory product. Be sure to get low angle nozzles, they save misting and water waste.
I have 4 inch I-20 sprinkler heads installed I have to replace one I was wondering if I could replace it with and I- 20 6 inch sprinkler head with no issues?
Glenn C on Jun 18, 2018
BEST ANSWER: I am not a Hunter employee, but the only issue in my opinion is how high it will be above the ground when not in operation. If you are going to use a shorter riser, or lower the supply line, there should be no problem as far as operation is concerned. It is just a longer tube and spring assembly.
Do the I-20-04 heads have a check valve?
Jean H on Jun 6, 2017
BEST ANSWER: Yes, you'll find the detail on the spec sheet offered with the I20's. The check valve is rated at 10ft.
What is the difference between the I-20 and the I-20-04 sprinklers? My old head has I-20 written on it. Which one should I use to replace it
Judd M on Aug 28, 2015
BEST ANSWER: The 04 just means it's a 4" pop-up rotor. It is a standard rotor.
how do you tell what length?
rudy f on May 18, 2013
BEST ANSWER: Depends on your application, after you install you sprinkler how much length will you need to clear any obstructions. I place mine right at or just below ground level, i have a flat lot and use low angle nozzles. 4" is adequate to clear the grass and works well. I Will note that 4" is the minimum I would ever go. If not sure go to the 6", as long as you don't have any depth issues, longer is better.
Is this a 3/4 inch female head?
A shopper on Jul 3, 2012
BEST ANSWER: Yes, it is a standard 3/4 inch pipe thread female fitting, radius coverage varies depending on the water pressure and size of the nozzle inserted as well as the diffusion depth.A minimum of42 psi for full coverage and a in line sprinkler pump for long runs is helpful,
I see a description for the Hunter I 20 that you can set it for non-reversing 360 circle but I can find how you set it for non-reversing?
Kevin M on Jun 16, 2015
BEST ANSWER: You don't need to make any special adjustment for non reversing. If you turn the arc adjustment 'screw' to the maximum angle it will automatically non reverse -- that is, it continues turning in the same direction. FYI, I've installed about 150 of these on my property and they are great sprinkler heads.
I have two different I-20 hunter sprinkler head. one is larger and a pop up the other is above ground, over my garden. How do I know which Hunter I -20 to get?
A shopper on Jul 16, 2014
BEST ANSWER: The part # is I20-00 in case you don't see the product in my first reply.
can i get this WITHOUT the check valve, or can i take it out?
A shopper on May 17, 2013
BEST ANSWER: Yes, the 4" height I20-04 is available without a check valve:

NCV = Witout check valve
(only available on 4" model)
Is this the same as the Hunter I-20 ADV? My current rotor has the letters ADV on the top of it
Barry F on Mar 20, 2013
BEST ANSWER: No real difference. They work the same and adjust the same. I have purchased all the different hunter rotors, and to me, the best way to go is the i-20 stainless steel. They are $4 more, but worth every penny. I live in Fl., so I use them year around. They have been much more reliable than the plastic. Just a thought.
what is the difference between this rotor and the check valve rotor? my current heads have a shut off valve on them.. am I looking at rhe wrong rotor? my rotors just sau hunter i-20 adj on the top.. :(
NIRAJ K on Jun 29, 2011
BEST ANSWER: The I-20 rotors have check valves in them. The check valve prevents water from leaking out of your system when the sprinklers shut off. This is important if your line of sprinklers is going downhill. Without the check valve the water will run out of the top of the lowest sprinkler and drain your line when the sprinklers shut down. The next time you turn on the sprinklers lots of air has to be displaced by the water coming into the line. It's noisy and not good for the sprinklers.
Have you found the retraction on this to be reliable? I lose too many rotors to the lawn mower from incomplete retraction... Many thanks!
GeorgeE on Dec 23, 2010
BEST ANSWER: Retraction does become a problem as head wears out. Mine usually begin to leak before. So I replace
The difference in 4 & 6 inch pop up, is it because of grass height?

What attachment would I use to evacuate the system at the end of season? Where would it be attached, would I need to do each zone and would each zone need an attachment to evacuate it of water?

Maximum head to head spacing for the 120-04 4?

Can you use fixed and rotating heads in the same zone?
Frederick on Aug 20, 2013
BEST ANSWER: The 4" should be sufficient for placement in areas where there are no obstacles to clear and the ground is fairly level.

Head to head spacing depends on many variables including nozzles size (GPM), water main pressure, number of heads/zone, etc.

Fixed and rotating can NOT be mixed on the same zone.

You can find lots of good PDF and video based information at Hunter's website. Go to Hunter Industries website and click on 'Support.' Select your product type (I40) and area of interest using the selectors provided

Good luck-I've had good success with my I40 Hunter sprinkler heads.
what is the difference betweenthis rotor and the PGP-04-4 in.Pop-up
Adjustable Arc,Rotor?
A shopper on Oct 19, 2011
BEST ANSWER: Both the PGP-04 and the I-20 4" pop-up rotors from the Sprinkler Warehouse are great sprinklers. The I-20, however, is an upgrade from the PGP series in both price, features, and, in my opinion, durability,. I personally like that the I-20 has a shut-off valve. This features gives me the option of turning off rotors in a zone that I don't want to come on for various reasons, such as when I want to adjust something without getting wet, or when an area in my yard needs more water then other areas. Whichever model is chosen, each is easy to install and operate. Both should give many years of maintenance free service.
how many feet does it cover? does this head rotate?
A shopper on Oct 13, 2011
BEST ANSWER: I have mine set to cover about 15 feet. You can adjust the spray distance ( up to 45 feet) with the different nozzles and flostop control on top of head. This is the main reason I like this head. The head rotates up to 360 degrees. Best head for the money that I have found.
What size of threaded connection are these?
Mark B on May 21, 2017
will the I20 fit in the housing of the PGP ADJ instead digging up and replacing the whole unit?
A shopper on Jul 9, 2016
are there 20 pieces per case and what is your case lot price on I-20-04 sprinkler heads?
A shopper on Nov 3, 2015
what is the best way to adjust the i-20 to go beyond the 180 degrees ?
A shopper on Sep 23, 2015
What is the difference between the I-20-00 and the I-20-04 Hunter heads?
Judd M on Aug 28, 2015
Not sure whether I have a 4 inch or a 6 inch pop up head. what do you measure to make that determination?
Craig M on Jul 3, 2012

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