Specification

Series LF800M4QT
Anti-Siphon Pressure
Vacuum Breakers
Sizes:
1
⁄2" – 2" (15 – 50mm)
Series LF800M4QT is designed to prevent backsiphonage of con-
taminated water into a potable water supply. The valve is ideally
suitable for irrigation systems, industrial process water systems
and other continuous pressure piping system applications 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shut-
offs
1
⁄2" – 1" (15 – 25mm). The 1
1
⁄4" - 2" (32 - 50mm) feature lever
handles.
•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 contaminat-
ed water. This assembly is not to be used where there is a possibil-
ity that a back pressure condition may develop. 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
LF800M4QT
1
⁄2" -
3
⁄4" (15 – 20mm)
LF800M4QT
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
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
*
JobName
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 Contractor
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Job Location
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 Approval
–––––––––––––––––––––––––––––––––––––––––––––
Engineer
–––––––––––––––––––––––––––––––––––––––––––––
 Contractor’sP.O.No.
––––––––––––––––––––––––––––––––––
Approval
–––––––––––––––––––––––––––––––––––––––––––––
 Representative
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*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
ES-LF800M4QT