Product Overview

Series LF800M4QT
Anti-Siphon Pressure
Vacuum Breakers
Sizes:
1
⁄2" – 1" (15 – 25mm)
Series LF800M4QT is designed to prevent backsiphonage 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 appli-
cations where the water enters the equipment at or below
its flood rim. The disc float and check valve are suitable for
temperatures 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. The LF800M4QT features
Lead Free* construction to comply with Lead Free* installation
requirements.
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).
•Nospecialtoolsrequiredforservicing
•LeadFree*castcoppersiliconalloy
Specifications
Pressure Vacuum Breakers
Ananti-siphonpressurevacuumbreakershallbeinstalled
where indicated on the plans to prevent the backsiphonage 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 silicone
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LeadFree*Anti-Siphon
Pressure Vacuum Breakers shall comply with state codes and
standards, where applicable, requiring reduced lead content. The
assemblyshallmeettherequirementsofANSI/ASSEStandard
1020 and shall be a Watts LF800M4QT.
For Health Hazard Applications
ES-LF800M4QT
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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LF800M4QT
1
⁄2" -
3
⁄4" (15 – 20mm)
LF800M4QT
1" (25mm)
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
LF800M4QT
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.
LEAD FREE
*
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.