Submittal Sheet

Series 800M4QT
Anti-Siphon Pressure
Vacuum Breakers
Sizes:
1
⁄2" – 2" (15 – 50mm)
Series 800M4QT is designed to prevent back-siphonage of
contaminated water into a potable water supply. The valve is
ideally suitable for irrigation systems, industrial process water
systems and other continuous pressure piping system applica-
tions where the water enters the equipment at or below its
flood rim. The disc float and check valve are suitable for tem-
peratures up to 140°F. The resilient sealing float o-ring and seal
check disc are silicone rubber which is resistant to heat, shock
and chemical attack.
Features
• Replaceable plastic seat
• Easy maintenance of internal parts
• Acetal bonnet acts as “freeze plug” to prevent body damage
• O-ring bonnet seal for less possibility of fouling
• Silicone seat disc for durability
• Test cocks positioned for easy testing and winterization
• Compact space saving design
• Standardly equipped with tee handle quarter turn ball valve
shutoffs
1
⁄2" – 1" (15 – 25mm). The 1
1
⁄4" – 2" (32 – 50mm)
feature lever handles
• No special tools required for servicing
• Bronze body for durability
Available Models
Suffix:
U – union connections (
3
⁄4" - 1" only)
Specifications
Pressure Vacuum Breakers
An anti-siphon pressure vacuum breaker shall be installed
where indicated on the plans to prevent the back-siphonage of
contaminated water. This assembly is not to be used where
there is a possibility that a back pressure condition may devel-
op. The assembly will incorporate an acetal bonnet with sili-
cone rubber O-ring seal and silicone rubber seat disc. The
valve shall have replaceable seats. Check assembly shall be
guided over its full stroke by ‘V’ notched guides. The assembly
shall meet the requirements of ANSI/ASSE Standard 1020.
Watts Regulator Company Series 800M4QT.
For Health Hazard Applications
ES-800M4QT
Job Name
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Contractor
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Job Location
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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800M4QT
1
⁄2" -
3
⁄4" (15 – 20mm)
800M4QT
1" - 2" (25 – 50mm)
Now Available
WattsBox Insulated Enclosures.
For more information, send for literature ES-WB.
Vent Spring
Vent Seal
Vent Float
Check Spring
Retainer
Check Spring
Check
Disc Holder
Check Disc
Hood Screws
Hood
Bonnet
Bonnet O-ring
Seat
Seat O-ring
Body
Test Cock
Inlet Shutoff
Valve
Outlet Shutoff
Valve
Test Cock
800M4QT
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.