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Conbraco 4A-500 Freeze Resistant PVB Backflow Preventer 1" FPT | CDC4A-505-A2F

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on sale $64.98
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Conbraco 4A-505-A2F 1 in. Freeze Resistant PVB Backflow Preventer

  • Conbraco 4A-500 (CDC4A-505-A2F) Freeze Resistant Backflow Preventer
  • Female Pipe Thread
  • 1 inch Pressure Vacuum Breaker

The Apollo Pressure Vacuum Breakers prevent contamination of the potable water supply due to back-siphonage. An integral freeze protection relief valve serves to reduce the possibility of damage due to intermittent freezing conditions. The modular check valve cartridge provides a captured spring, a replaceable seat, and a reversal silicone seat disc. This Made in America assembly features Apollo ball valves with stainless steel handles and nuts as standard and carries the five-year Apollo factory warranty.

Features & Benefits

  • Low pressure loss documented by independent approval agencies
  • Built-in freeze resistance feature standard
  • Easily removable modular check valve cartridge
  • Captured stainless steel springs
  • Apollo ball valves w/ SS handles & nuts standard
  • Test cocks located for easy draining
  • Corrosion resistant
  • No special tools required
  • Unique canopy detachment
  • Designed, cast, machined, assembled and tested IN THE USA

Product Details

  • ASSE 1020 - (1/2" - 2")
  • CSA B.64.1.2 - (1/2" - 2")
  • Maximum Operating Pressure 150 psi
  • Temperature Range 33°F 140°F
  • Part Name: Material
  • Body, Ball Valves, Test Cocks: Bronze C84400 or C89836
  • Canopy: UV-Resistant ABS
  • Bonnet: Glass-Filled PPO
  • Check Valve Cartridge: Glass-Filled PPO
  • Springs: Stainless Steel
  • Seat Discs: Chloramine-resistant Silicone
  • Float: Glass-Filled Polypropylene
  • O-rings: Chloramine-resistant EPDM


Irrigation systems supplied by domestic or private potable water systems are considered to be a potential pollution hazard to the water supply. These systems must include protection to prevent possible backflow of irrigation water into the potable water supply.

Federal law requires a proper backflow device to be installed on any watering system to prevent contamination of the supply; whether it be pump or city water. Check your local water authority for installation requirements & codes. In many rural areas; specific requirements for landscape irrigation systems may not be covered in local plumbing codes and/or enforcement may be limited. HOWEVER...limitation in local authority does not alter the basic requirement for protection of the potable water supply.

Helpful Articles & Videos



Replacement Parts

Dimensions (in.)
Ordering No. Size A B C Wt.(lb.)
4A50302 1/2" 4 1/2 3 3/4 7 1/4 3.2
4A50402 3/4" 4 3/4 4 1/8 7 5/8 3.8
4A50502 1" 5 3/8 4 5/8 8 3/8 5.2
4A50602 1 1/4" 7 3/8 5 3/4 10 1/4 9.1
4A50702 1 1/2" 7 1/2 5 7/8 10 3/8 12.5
4A50802 2" 8 7/8 6 3/4 11 7/8 21.0
Product Tag:
Low Cost Solutions
Backflow Size:
Lead Free:
Not Lead Free
End Connection:
Size (in.):
Lead Free:
Not Lead Free
Max Working Pressure:
150 PSI
Temperature Range:
33F to 180F
Pressure Vacuum Breaker (PVB)
5 Years
Test Cocks:
Stainless Steel
Hydrostatic Test Pressure:
300 PSI
Main Valve Body Materials:
Advance Features:
Freeze Resistant
4.9 / 5.0
12 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Quality part and great value
When my old leaky valve finally broke, I cringed at the thought of how much this would cost to replace. I decided to check online and found this great value. I did the install myself and everything is great - and - no more leaks
August 1, 2018
1 year ago
Good backflow preventer valve
Great quality back-flow preventer valve. Heavy construction, solid design. I was using this Apollo/Conbraco unit to replace a Watts 800M4 series that was leaking after 15 years. A word of caution is to pick up some extra PVC 45 degree elbows and extra tubing. The Apollo/Conbraco units are a little longer in design and won't fit in place of the smaller Watts units. Easy fix is just to use some elbows to mount the new valve. Cheers, J
April 23, 2015
Great product, excellent price and delivery. Very sasitified with sprinkler warehouse. Good selection of products, good website layout,easy to use. Two thumbs up!!!!
December 13, 2018
1 year ago
The Sprinker Warehouse had the part we needed in stock and it was delivered to us within 2 days. We were able to install it the next day and have not had any problems with it.
April 21, 2018
1 year ago
I would for sure recommend. Works great. I had to replace my old one because of a freeze.
February 22, 2018
1 year ago
Good buy
This was fast shipped low price and easy install will wait to see how it holds up
September 17, 2018
1 year ago
Product is great
Product is great ! It exceeded my expectations. This will save my clients a lot of money.
October 24, 2018
1 year ago
Just what I ordered
The part was just what I ordered and was actually a little surprised it was so nice when I got it. I am a Industrial Mechanic for a career and we use Apollo Brand valves all the time in the chemical plant environment. Good quality stuff
June 11, 2019
8 months ago
Excellent service.
My Backflow Preventer was easy to install and works perfectly. I called your customer service with a technical question, and the technician was very courteous, knowledgeable and answered my question. I am a very satisfied customer and will recommend Sprinkler Warehouse to my family and friends.
March 17, 2018
1 year ago
Awesome unit for the price and worth the money. I will buy these all the time from now on
May 3, 2018
1 year ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 8 questions Browse 8 questions and 24 answers
Why did you choose this?
SprinklerWarehouse.com Store
made in America - freeze protection
Randal A on Nov 17, 2018
High Quality and On-Sale :-)
Grimm on Jun 18, 2018
made in America - freeze protection
Randal A on Nov 17, 2018
D A on Aug 3, 2018
High Quality and On-Sale :-)
Grimm on Jun 18, 2018
orginal part broke, need to replace ans want to change entire part
G S on Jun 5, 2018
Good product used before
Shayne W on May 21, 2018
P B on Apr 13, 2018
Made in USA.
I R on Apr 4, 2018
Great Price, and I like the reviews on this one, since I am familiar with this brand of valves on the system.
L O on Apr 3, 2018
replacement for existing
C G on Mar 17, 2018
Replace broken unit and Sprinkler Warehouse had the best price.
Jeffrey O on Mar 16, 2018
it the same as the existing one
J K on Mar 10, 2018
price and I have its old model installed
vrana R on Feb 19, 2018
Replacing busted backflow preventer
G E on Feb 1, 2018
For replacement
E R on Jan 4, 2018
Replaced previous. However, it did freeze.
Robert W on Nov 15, 2017
becuase it is the right size and the price is fair/bagain compared to other companies. Also I need it to sell my house and meet local building irriagation codes. I am a senior and a DIY guy.... keeps my mind sharpe to solve problems and fix them
W A on Oct 11, 2017
That's what is currently in my house.
D B on Mar 18, 2017
B R on Mar 6, 2017
replacement of freeze damaged unit
J A on Feb 3, 2017
Replacing a valve damaged from freezing weather. Like the fact this this one is "freeze resistant".
B O on Jan 8, 2017
D A on Aug 3, 2018
orginal part broke, need to replace ans want to change entire part
G S on Jun 5, 2018
Does Sprinkler Warehouse offer "lead-free" PVB valves? My local county code now requires these (as of January 2015).
Earl on May 1, 2015
BEST ANSWER: Hi, There are lead free options for PVB back-flow preventers. You have to check the model numbers, not sure if sprinkler warehouse carries them you'll have to call. Generally municipalities only want lead free for inside your home, outside irrigation is many times exempt. So always check with your township code office. Cheers, J
i need two plastic nuts for this unit that is 10 years old, are they available?
linda a on Feb 14, 2017
can you change the orientation to pipes coming in on right and bottom, instead of left?
A shopper on Jun 21, 2017
BEST ANSWER: On mine the inlet is on the bottom and outlet on the right.it is designed for this water flow direction to prevent backflow from the irrigation to the city water.I changed my pipes and fittings to accommodate. It was well worth the extra money to invest in the galvanized pipes and fittings.
...is this a complete assembly including the ball valves?...
Marc P on Apr 23, 2015
BEST ANSWER: Yes, all the valves are included. The entire unit appears to be of high quality too.
My bonnet is broken. Can I just replace that?
Marsha B on May 16, 2018
Conbraco 1" pvb - serial lz298
I am looking for a replacement valve for our sprinkler the numbers on the unit are above. Can you recommend the right replacement part?? Thanks
Kari S on Jul 1, 2016
Are valves available for horizontal to vertical (downward) flow?
A shopper on May 8, 2015

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