Order today, ship today!

Left for Same-Day Shipping

Free Shipping Offer to Orders over $149

Weathermatic Nitro, 12000, & 21000 Replacement Solenoid 1" | S20PSAK

Out of stock
Free Shipping on Orders over $149
Sale Price $12.58
Our Price $24.13
You Save 48%

Weathermatic S20PSAK Solenoid for Nitro, 12000, and 21000 Valves

  • 24 VAC Solenoid
  • Fits Nitro, 12000 and 21000 Series Valves

The Weathermatic S20PSAK is the Replacement Solenoid for Nitro, 12000 and 21000 Series Valves.

Features & Benefits

  • Weathermatic S20P Solenoid
  • Weathermatic New S20P Solenoid The M24E Replacement.
  • Weathermatic Has Discontinued The M24E Square Shaped Solenoid
  • Also Includes The Cylinder Shaped Piston

Product Details

  • 24VAC/ 60 Hz: Inrush: 9.48 VA, Holding: 5.11 VA
  • 24VAC/ 50 Hz: Inrush: 1066 VA, Holding: 5.97 VA
Product Type:
Replacement Solenoid
Valve Compatibility:
Weathermatic 12000, Weathermatic 21000, Weathermatic Nitro, 1"
Valve Repair Size:
Size (in.):
Valve Compatibility:
Weathermatic Nitro|Weathermatic 12000|Weathermatic 21000|1"
Size (in.):
Replacement Solenoid
4.7 / 5.0
38 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
work great
Bought three, two to replace M24E and one for a spare. Both working great.
September 11, 2018
over 2 years ago
Awesome product and good quality thank you so much!
April 7, 2018
over 2 years ago
An exact fit for a lot less cost and quick delivery.
Easy to install in just a few minutes
September 6, 2017
over 3 years ago
Class Act
I had trouble finding this part in the local store. So then I went to Ebay and Amazon and the wanted more money than it was worth. I could buy the whole valve for just a couple of dollars more. Then I came across Sprinkler Warehouse. They had the part at half of the price of everybody else and they sent it free shipping on a fast track. If all of America would operate like theses guys, America would be great again. I will be seeking all my sprinkler issues with these guys. Thanks
July 26, 2018
over 2 years ago
Part was exactly as advertised and solved the problem
Looks and works like the original. Have to be careful during installation not to lose the parts inside the solenoid. They fall out very easily.
December 7, 2015
Best place for your sprinkler needs
Great it replaces the old solenoid and works perfectly
July 27, 2019
1 year ago
Excellent part to replace old one
Work as expected and easy to replace. I am ordering more as spare for future replacement.
September 17, 2020
1 month ago
Needed Replacement Solenoids
These solenoids worked perfect. Weathermatic valves aren’t used much in my area so local supply didn’t carry them and prob would have been overpriced if they ordered. Received in 2 days. Thanks!
September 14, 2018
over 2 years ago
Excellent replacement
Worked well as a replacement for discontinued model.
June 23, 2015
just what I needed worked well looked like the pictures
November 9, 2017
over 2 years ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 30 questions Browse 30 questions and 105 answers
Why did you choose this?
SprinklerWarehouse.com Store
B G on Feb 21, 2019
Existing old solenoid is worn out. Needed replacement parts
R O on Oct 15, 2018
B G on Feb 21, 2019
purchased it before. It fits my valves.
Joe M on Dec 29, 2018
Existing old solenoid is worn out. Needed replacement parts
R O on Oct 15, 2018
The M24e is installed on my irrigation system valve manifold
A A on Oct 13, 2018
I need it
D O on Oct 2, 2018
need these solenoids to replace a defective one in my system, and to have a couple spares.
Douglas S on Sep 15, 2018
Needed a replacement solenoid. Price here was actually cheaper price compared to cost at retail stores.
A N on Sep 12, 2018
M A on Aug 25, 2018
It was a replacement part.
R O on Aug 10, 2018
Needed this to repair a customers valve. Sprinkler Warehouse carries all the brands and ships quickly. I'd rather order parts as needed then keep costly inventory on the shelf.
P H on Jul 31, 2018
replacement part
C E on Jul 22, 2018
I talked to different persons at Sprinkler Warehouse for a Weathermatic S24B solenoid. The second person said this is what I needed.
P A on Jul 20, 2018
We were able to get the part the fastest.
K L on Jul 19, 2018
Replacement for my Weathermatic ones.
E F on Jul 14, 2018
need that model
ANONYMOUS on Jul 13, 2018
My 8 Weathermatic valves are about 30 years old. The wires on the solenoid is showing wear and tear. Because they have free shipping today, I bough this and a couple of other parts as spare.
M A on Jul 13, 2018
exact same part I needed
R O on Jul 11, 2018
to replace old one, my controller was telling me this zone had a short.<br />Starting with this first
Eric A on Jul 10, 2018
Part is compatible with my existing system
T J on Jul 8, 2018
Original is worn out.
B T on Jul 5, 2018
ordered before
M K on Jul 1, 2018
Needed solenoids for my in-ground sprinkler system.
W B on Jul 1, 2018
Just looks like the right part for the valve I have.
D E on Jun 15, 2018
Needed for repair
Joe on Jun 15, 2018
C M on Jun 7, 2018
Need it for my aging valves
A W on Jun 5, 2018
to replace shorted out units
David B on May 31, 2018
replace broken solenoid
L A on May 30, 2018
need to replace parts used
D R on May 29, 2018
because we needed it
A N on May 22, 2018
M E on May 18, 2018
Present valves require repair.
John H on May 15, 2018
need for my system, have ordered before and liked the price and service
R O on May 8, 2018
Peter V on May 5, 2018
My weathermatic valve is not working anymore ... solenoid needs replacement.
M S on May 5, 2018
They are what I needed
M M on Apr 29, 2018
I have multiple 21000 valves. swapping solenoids is cheaper than replacing the valve.
Joe M on Feb 18, 2018
what i needed
gina l on Feb 11, 2018
Rebuild existing valves
Robert H on Nov 10, 2017
On Hand Spare
John C on Oct 1, 2017
not available at hardware outlets.
R A on Sep 29, 2017
Need to repair a couple valves
Jeffrey H on Sep 11, 2017
My old weather matic M24E solenoid are starting to burst so this is the replacement that i need. I hope it works because all the universal ones from the box stores don't work.
Z L on Aug 22, 2017
Because this is the model that I have.
A R on Aug 3, 2017
Jeffrey R on Aug 2, 2017
I have a couple of valves that use the Weathermatic.
Terry E on May 15, 2017
replace old solenoids
R I on Apr 18, 2017
To replace a shorted solenoid coil, and to have a spare on hand.
T E on Mar 18, 2017
old one was broken
S P on Mar 14, 2017
It's what I needed
C R on Mar 12, 2017
purchased it before. It fits my valves.
Joe M on Dec 29, 2018
The M24e is installed on my irrigation system valve manifold
A A on Oct 13, 2018
is there a rainbird replacement for weathermatic M24E or the s20psak solenoid?
A shopper on Jun 24, 2012
I need to replace several solenoids. How does the solenoid connect to the valve? I can't figure out how to get the old solenoid off.
Michele M on Apr 1, 2011
BEST ANSWER: First turn the water off to the system using the main shut off valve. Wait a couple of minutes for the pressure to stabilize in the system. On the solenoid, disconnect the two leads then grab a hold of it and turn it counter clockwise just like if you were unscrewing it. When it's comes off, any remaining water pressure will cause the valve area to slightly flood so have a wet-vac or something ready to remove water from the hole. This should only happen on the first solenoid or any that are down hill. To install, spin the new one on securely clockwise and attach the two solenoid leads
Is there a Rainbird solenoid that will work in place of the M24E Weathermatic or the S20PSAK solenoid?
Tom M on Jun 24, 2012
BEST ANSWER: I checked around and could never find a rainbird replacement. But then, neither the Lowe's nor Home Depot I go to knew much about sprinklers. I just found it easier to go on line and order the part from Sprinkler Warehouse.
does this unit replace an S20p solenoid?
A shopper on May 29, 2018
BEST ANSWER: Yes, it replaces S20P without issue.
Will this replace the s24b solenoid?
A shopper on Sep 7, 2011
BEST ANSWER: Yes,it will work
I need to replace the solenoid on a very old weathermatic valve,the part # is SOL # 24,24 vac 50/60 hz 2 watts
Will this one work ?
pat m on Jun 25, 2014
BEST ANSWER: We use these solenoids (24v) on our 21000 1.5in. series valves in a community park splash pad which means this solenoid is cycled up to a couple hundred times in a days use with no problems. If you have a 21000 or 12000 series valve it should work just fine.
Should the hand valve be screwed down or screwed up to change the solenoid?
Cindy S on Jul 22, 2018
BEST ANSWER: My system doesn't have hand valves. I turn the water off at the main source, unscrew the solenoid screw a new one in then wire the new solenoid to the same connection as the old one and turn the water back on.
what cause my sprinkler system to turn on and off in less than a minute?
A shopper on Sep 10, 2018
BEST ANSWER: I think you should look at your Sprinkler controller. The solinoid turns the sprinkler on ( Springer control system sends about 26 volts to the solinoid) and shuts the sprinkler off (sprinkler system switches off the 26 volts).. The sprinkler control system controls the voltage. A malfunctioning solinoid usually doesn't turn the system on or off....a improperly programmed controller can.
my sprinkler system in one zone is not turning off??
chuck c on Jun 17, 2016
BEST ANSWER: A couple of thoughts come to mind. First, is this a normal sprinkler line, or drip. Nitro valves don't turn off with drip when they get older (due to the back pressure and low flow I assume) - I remove the valve diaphragm (after turning the water supply off!), clean it off and reinstall it and it'll work for another year. I really need to buy a new diaphragm and replace it one of these days!

If not that, the first thing to find out is if it's the controller or valve. Disconnect the solenoid wire and see if the valve turns off or not. If not, it's the valve. Check for leaks, especially around the manual on/off lever - a leak there will make the valve think it's being manually turned on. If you're mechanically inclined, take the valve apart and check the diaphragm for cracks, dirt, etc. I hope this helps.
I need to replace several solenoids in my Weathermatic Nitro(I think thats what they are) valves. The current solenoid indicates Model M24B.

I would like to use the best possible solenoid to replace the old solenoids.

Is the best possible solution going to be the WEATHERMATIC S20PSAK?
Jay on Apr 6, 2015
BEST ANSWER: I have a sprinkler system that is about 4 years old with S20PSAK solenoids for 16 Nitro valves (in very sandy soil). One solenoid had a random short in it from the beginning and sometimes it would not shut off. I finally replaced it with another S20PSAK solenoid and it has been fine ever since. No problems ever with the other 15 (except for moles or gophers chewing through the wires),
my current weather matic solenoid says s24b. will this part work as a replacement?
A shopper on Jun 13, 2013
BEST ANSWER: I purchased the s20psak for my system when the original solenoid had a different number on it (I can't remember exactly what it was, 24v something) and it works fine for me.
Robert Howard
will this replace a M24E?
A shopper on Aug 19, 2011
BEST ANSWER: I am sorry I do not know the answer for sure. Looking at the Sprinklerwarehouse website it looks like it is. I know I used it on my Rainbird system that had solenoids that looked like the M24E and they work well. I hope this is some help to you. Good luck
will this replace a M24E solenoid?
A shopper on Jul 20, 2011
BEST ANSWER: I am not sure if it will fit your system or not. I had to call Weathermatic to find out what Solenioid would fit mine. My system is about 25 years old. Weathermatic phone nr is 888-484-3776
your web site says you have started carrying Water Master irrigation valve parts but I can't seem to find them?
Buddy on Aug 1, 2017
BEST ANSWER: Please look in the nitro solenoid parts section
my solenoid says s20p will this work?
A shopper on Jul 28, 2013
BEST ANSWER: yes, it should
Will this solenoid work on a 10 year old valve? I bought a new Weathermatic solenoid from a sprinkler store and it did not work. The retractable plunger did not have a wide enough diameter.
A shopper on Jun 12, 2013
BEST ANSWER: Did the new solenoid properly screw onto the 10 year old valve? My valves are close to 10 years old and they work. If the solenoid did screw on properly what happens when the zone is turned on? I'm sure you made sure plunger and spring are in when it's screwed in?
I have a weather matic model M24E solenoid
24V 6.5 / 6.7 VA 150PSI
Would the S20PSAK be a valid replacement?
eric r on May 8, 2012
BEST ANSWER: Short answer yes. I went round and round trying to find the right replacement for the M24E. S20P or S20PSAK??? I ordered these, the title says S20PSAK and the description says S20P. The item themselves said S20P on them while the order and packing slip said the SKU was S20PSAK. I'm pretty suer they are interchangeable.

Again, the S20P are what I wanted and what came. I used two so far to replace the M24E and hey work great.
Will this solenoid work in my Irritrol Rain Dial 600 sprinkler system? I'm having a hard time finding one (S20P). Thanks.
A shopper on Apr 19, 2012
BEST ANSWER: This solenoid is 24VAC. Find out the output voltage of your system. 24VAC is normal these days. If you need it to replace a solenoid on a valve other than a Weathermatic Nitro, I'd guess probably not. If it's for either Nitro, yes, it works perfectly.
My Nitro 12000 valves will not close completely even after I disconnect power from the Timer. Could it be my solenoid? Or the wiring? Help please. Thank you.
A shopper on Oct 11, 2011
BEST ANSWER: Most of the time, this is due to dirt inside the valve. This is very easy to fix. Open the 4 bolts around the valve and lift out the top of the valve. Then take out the rubber disphragm. You might find a small stone on the bottom side of the disphragm. If that does not fix the problem, try adjusting the knob on top of the valve. Giid luck!
will this be able to replace the s24b solenoid?
Irma R on Sep 7, 2011
The S24B is typically used in brass valves because it has brass
threads. I'm really not sure if the S20PSAK will work... It might...
I have a weathermatic sl800 is this the correct solenoid?
A shopper on Jul 2, 2016
BEST ANSWER: never used your valve model, but if the threads are the same as the one you are replacing, it should work fine. All you're really looking for is a good fit and 24 volts with 20-60 ohm capacity. the manufacturer really doesn't matter...
Is the S20PSAK the correct replacement for the S20P solenoid?
joe M on Aug 3, 2015
BEST ANSWER: Yes it works
Will Weathermatic S20PSAK Solenoid for Nitro, 12000, and 21000 Valves replace Weathermatic solenoid Model M24E?
David G on Jun 2, 2015
BEST ANSWER: Weathermatic S20P solenoid replaced the M24E solenoid but I am not sure if the S20PSAK for Nitro Series valves is the same as the S20P.
did this replace the weathermatic m 24 e solenoid?
tony c on Jun 30, 2013
is this a 200 psi max unit?
A shopper on Sep 12, 2012
BEST ANSWER: The valves that these solenoids fit are rated to 150psi. Note that this is just a replacement solenoid, not the entire valve. (but the whole valve with solenoid attached doesn't cost much more)
Is there a weatherman valve w-24E solenoid replacement?
A shopper on Jul 9, 2017
Can you deliver to Cyprus for an order of 20 if so how much postage if not can you deliver to the UK?
Gavin C on Oct 6, 2016
I need an M24E Selenoid for an older (2001) Weathermatic sprinkler valve. Do you stock these?
Bill M on Jul 18, 2015
I this solenoid suitable for 1202EF valve ?
brian d on Nov 14, 2013

We found other products you might like!

  1. on sale $15.20
    you save 46%
  2. on sale $14.32
    you save 46%