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

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Sales Price $111.17 Our Price $165.95 You save 33%

Conbraco 4A-505-A2F 1 in. Freeze Resistant PVB Backflow Preventer

  • Conbraco 4A-500 Freeze Resistant Backflow Preventer
  • Female Pipe Thread
  • 1 inch Pressure Vacuum Breaker
  • Conbraco Industries, Inc. continues to operate as Apollo Valves


Features & Benefits of the Conbraco PVB Backflow Preventer

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.

  • 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.

Related Articles For The Conbraco Freeze Resistant 1 in. Backflow Preventer

Replacement Parts

Dimensions (in.)
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

Conbraco 4A-500 Freeze Resistant PVB Backflow Preventer 1 in.

Features Of The Conbraco-Apollo Pressure Vacuum Breaker

The Conbraco-Apollo pressure vacuum breaker is designed with a built-in freeze resistance feature and an easily removable modular check valve cartridge. The unique canopy detachment is made of UV-Resistant ABS. The body of this device is designed, cast, machined, assembled, and tested in the USA. The installation of the PVB does not require the use of any special tools.

5 Product Details For The Conbraco 4A-500 PVB:

  • Temperature Range 33°F 140°F
  • Maximum Operating Pressure 150 psi
  • Canopy: UV-Resistant ABS
  • Check Valve Cartridge: Glass-Filled PPO
  • Seat Discs: Chloramine-resistant Silicone

Important Product Details Of The Conbraco Pressure Vacuum Breaker

The Conbraco Freeze Resistant PVB is manufactured with industry-standard materials. These materials include a glass-filled PPO check valve cartridge and bonnet. The o-rings are made of chloramine-resistant EPDM and the float is made of glass-filled polypropylene. The seat discs are manufactured with chloramine-resistant silicone. Like many pressure vacuum breaker designs, the springs are made with strong stainless steel material. The maximum operating pressure for this device is 150 PSI and the temperature range is 33°F to 140°F.

Learn How To Install A Conbraco 4A-500 Freeze Resistant PVB Backflow Preventer

The Conbraco-Apollo PVB should be installed above ground as close as possible to the isolation valve and within a few inches of a trench that leads to the zone control valves. On the pressure vacuum breaker assembly riser, measure up twelve inches and place a second mark. If the riser isn’t tall enough, extend it with a coupling. This mark represents the height of the vertical center of the outlet valve. For more details about how to properly install a PVB assembly visit our Sprinkler School articles and tutorial videos.

Warning About Sprinklers Supplied By Domestic Potable Water Systems

In accordance with federal law, a backflow device must be installed for use with any watering system to help prevent contamination of the water supply. It is recommended that customers check their local water authority for installation codes and requirements. In rural areas, the exact regulations for landscape sprinkler systems may not be covered in local plumbing codes and enforcement of those regulations may be limited.

Watch these related videos to learn more about the Conbraco 4A-500F Freeze Resistant Backflow:

Frequently Asked Questions

What is a Conbraco 4A-500 Freeze Resistant PVB Backflow Preventer?

The Conbraco-Apollo pressure vacuum breaker is designed to prevent the contamination of potable water caused by back-siphonage. The integral protection relief valve reduces the possibility of damage due to severe freezing conditions. The internal parts of this device are in line to allow for easier access during routine maintenance or sudden damage caused by severe weather conditions.

Do I need to winterize a freeze resistant backflow preventer?

Although the Conbraco 4A-500 Freeze Resistant PVB Backflow Preventer has a standard built-in freeze resistance feature, it is still recommened to winterize the device. By installing a backflow pouch and covering the PVC pipes with polymer foam insulation, your device is less likely to become damaged during severe freezing weather conditions.

How do I protect my backflow device from being stolen?

Backflow devices that are installed above ground can be protected from theft by installing either an artificial rock. backflow enclosure or gorilla cage. The rocks are designed to cover your backflow and also make it blend into the landscaping. The backflow enclosure is designed to discourage the thief from a quick job. The gorilla cage is effective because it is bolted down to a concrete pad making for strong unitized construction. All of these products can be purchased at Sprinkler Warehouse.

More Information
Brand Conbraco
Test Cocks 2 FEMALE
Max Working Pressure 150 PSI
Hydrostatic Test Pressure 300 PSI
Temperature Range 33F to 180F
Main Valve Body Materials Bronze
Elastomers Silicone
Springs Stainless Steel
Advance Features Freeze Resistant
Warranty 5 Years
Size 1 in.
Connection FPT
Lead Free Not Lead Free
Manual (1.55 MB)
Specifications (161.72 kB)
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