Watts 1" 800M4-QT

Item Number: 0388002
1 1
$409.72
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 1 inch
  • Weight: 7.0 lb
  • Body Material: Bronze
  • Maximum Working Pressure: 150 PSI
  • Minimum Working Pressure: 15 PSI
  • Temperature Range: 33°F to 140°F
  • Internal Parts: Easily serviceable in-line
  • Corrosion Resistance: Silicone rubber and acetal bonnet
  • Approvals: ASSE 1020, UPC, CSA

Description

The Watts 1" 800M4-QT is a bronze anti-siphon pressure vacuum breaker designed to prevent backsiphonage of polluted water into potable water supplies. Ideal for continuous pressure health hazard applications such as irrigation and industrial process water systems, this valve ensures water safety. It features a durable bronze body, silicone rubber seals resistant to heat and chemicals, and an acetal bonnet for freeze protection. The unit operates between 15 PSI and 150 PSI and includes quarter-turn tee handle shutoffs and test cocks for easy maintenance and winterization. It is ASSE 1020, UPC, and CSA approved, providing reliable backflow prevention for outdoor installations.

Help Me Connect

Installation Guidelines

  • Install this valve in a continuous pressure potable water supply system.
  • The installation point must be 12 inches above the highest point of the downstream piping.
  • The valve must be installed with the supply connected to the bottom and in a vertical position.
  • Allow adequate space for periodic inspection, servicing, or testing.
  • Do not install in areas where freezing or water spillage may cause damage; ensure adequate drainage/freeze protection in cold weather.
  • Ensure supply and discharge piping are not undersized.

Compatibility and Warnings

This anti-siphon pressure vacuum breaker is designed to protect against backsiphonage. It is not designed or approved to protect against backpressure backflow or water hammer shock. For protection against backpressure backflow, consider installing a Watts 909/009 Reduced Pressure Zone backflow preventer.

View full details

Additional Details

The Watts 1" 800M4-QT anti-siphon pressure vacuum breaker helps prevent the reverse flow of polluted water from entering the potable water supply due to backsiphonage. This assembly is ideal for health hazard continuous pressure applications like irrigation systems and industrial process water systems where water enters equipment at or below its flood rim.

Features

  • Bronze body construction ensures durability.
  • Silicone rubber sealing float O-ring and seal check disc are resistant to heat, shock, and chemical attack for reliable performance.
  • Acetal bonnet acts as a "freeze plug" to prevent body damage.
  • Test cocks are positioned for easy testing and winterization draining.
  • Internal parts are easily accessible and serviceable in-line from the top of the unit without special tools.
  • Includes tee handle shutoffs for quarter-turn operation.
  • Designed to operate with a minimum pressure of 15 psi and a maximum pressure of 150 psi.

This valve is not designed, tested, or approved to protect against backpressure backflow or water hammer shock. For protection against backpressure backflow, install a Watts 909/009 Reduced Pressure Zone backflow preventer.

This product is Not Lead Free Compliant.

Specifications

  • Product Type: Anti-Siphon Pressure Vacuum Breaker
  • Model: 800M4-QT
  • Size: 1 inch
  • Body Material: Bronze
  • Springs Material: Stainless steel
  • Bonnet Material: Celcon®
  • Bonnet O-ring Material: Silicone rubber
  • Vent Disc Material: Silicone rubber
  • Disc Holder Float Material: Polypropylene
  • Check Valve Disc Material: Silicone rubber
  • Check Valve Seat Material: Noryl® plastic
  • Maximum Working Pressure: 150 PSI (10.3 bar)
  • Minimum Working Pressure: 15 PSI (55 kPa)
  • Temperature Range: 33°F to 140°F (0.5°C to 60°C)

Dimensions (1 inch)

  • Dimension A: 7 1/2 inches (191 mm)
  • Dimension B: 7 1/2 inches (191 mm)
  • Dimension C: 2 3/4 inches (70 mm)
  • Dimension D: 4 3/4 inches (121 mm)
  • Dimension E: 4 7/8 inches (124 mm)
  • Dimension G: 3 7/16 inches (87 mm)
  • Weight: 6 lbs (2.7 kg)

Certificates & Approvals

  • ANSI
  • USC
  • ASSE 1020
  • SP
  • UPC
  • USC-FCCCHR
  • CSA
  • Approved by Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California

FAQs

What is the primary purpose of the Watts 800M4-QT anti-siphon pressure vacuum breaker?

Its primary purpose is to prevent the reverse flow of polluted water, known as backsiphonage, from entering a potable water supply system. This ensures the safety and cleanliness of drinking water.

Where is this backflow preventer typically installed?

It is ideal for health hazard continuous pressure applications like lawn irrigation systems and industrial process water systems. It must be installed at least 12 inches above the highest point of the downstream piping, with the supply connected at the bottom and in a vertical position.

What is the operating pressure range for the 1" Watts 800M4-QT?

This device is designed to operate effectively within a minimum working pressure of 15 PSI (55 kPa) and a maximum working pressure of 150 PSI (10.3 bar).

Are the internal components of the 800M4-QT easily serviceable?

Yes, the internal parts are designed for easy access and can be serviced in-line from the top of the unit without requiring special tools, simplifying maintenance.

Does this device protect against backpressure backflow?

No, anti-siphon pressure vacuum breakers are specifically designed to prevent backsiphonage. They are not approved or tested to protect against backpressure backflow or water hammer shock. For backpressure protection, a Watts 909/009 Reduced Pressure Zone backflow preventer is recommended.