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c:: 'W 61 f STOP Overfill Prevention '"The Stopper") is designed to prevent ing of above ground storage tanks viding a positive shut-off during a irized-fill (pump -on fill) delivery. ;topper' threads into the fill opening an integral part of the fill tube. ,PW6if STOP is fully adjustable to br easy installation in new or existing ground tanks of various heights and storage capacities. The Stopper is a single-action, complete shut-off valve. When the liquid level rises to your specific, pre -determined tank capacity, the valve mechanism is released and automatically closes with the flow of the product. Any excess product left between the valve and the fuel delivery coupler is drained into the tank through internal drain vents. The drain vents on the 61fSTOP act as an anti -siphon, by introducing air/vapor into the fill line, to help isolate the tank from a potential siphon due to a broken or leaking fill pipe. The 61 f STOP, available in either 2" or 3" full -flow models, maximizes flow rates and minimizes delivery times. The Z'61 f STOP requires a 4" tank opening and minimum tank ullage (space from the top of the stored product to the inside top of the tank) of 8" on the 61 f STOP -1000 Cylindrical Float model and a minimum ullage of 4" on the 61 f STOP - 2000 Float Arm model. The 61 f STOP -1000, with the cylindrical float, eliminates the need to position the valve to avoid tank walls or cross -bracing. The 61 fSTOP-2000 with the float arm allows for increased usable storage capacity in the tank, and is well-suited for small capacity rectangular ASTs. The 3" 61 f STOP requires a 6" tank opening and incorporates a cylindrical float requiring 8" of tank ullage space. 284 Valve Body, Adaptor and. Collar: cast aluminum Poppet: Cast aluminum, hard -coated Cam: Stainless steel Follower: brass Shaft: CRS zinc -plated i Bearing: Sintered bronze 6lfstop-1000 61fStop-2000 61fstop-3050 Float: Closed -cell nitrile _ Nipple: 2" - 3" schedule 40 steel pipe Lower Nipple: 2" - 3" schedule 40 steel pipe with Duragard® coating 61 f Stop.1000T Features ® ASpecial Crossbar Tank -inlet Adaptor — is provided with each Stopper to provide for tight -fills and help prohibit open - fills. Mounting hardware, upper drop tube and 14" lower drop tube provided (longer -length drop tubes can be purchased or added). Completely Automatic Operation — no pre -checks to perform, no resets, and no overrides to be broken or abused. Direct or Remote -Fill Compatible — fuel delivery couplers can be connected directly to the 61 f STOP, or steel pipe can be threaded into the top of the valve and piped to a remote location where the couplers are contained in a 211 -RMOT Spill Container. ;,, Cf1pfjD 61fStop-2000T 61fStop-3050T a Integral Antl-Siphon Valve — drain vents on the 61 f STOP act as an anti -siphon, by introducing air/vapor into the fill line after the valve actuates, to help isolate the tank from a potential siphon due to a broken or leaking remote -fill pipe. + 150 psi (10 bar) Pressure Rated* with Low Pressure Drop — to enable quick, safe delivery of fuel into the tank. 25 GPM (95 Ipm) Minimum Flow Rate Required. UL and ULC Listed — to satisfy Third Party accreditation requirements of many jurisdictions. B CARB Approved VR -401-A; VR -401-B *OPW does not recommend pumping pressures above 100 psi for Class 1 B fuels or remote applicattons and we make no warranties for products use in conjunction With the.61 fSTOP. NOTE:..OPW recommends the use of the 61 fSTOP with clean product only. Debds and. other products such as contaminated waste o€I maycause improper operation of the valve. , NOTE: The 61(Stop can be used in graAty drop provided the minimum flow Pate is maintained. A fight shutoff isnot achieved in the closed position. However with a minimum tank size of 1,000 gallons, the leak rate will provide a 30 -minute warning before the tank is full Approvals GARB EVR Certified and ListingsQL VC VR -401-A; VR -401-8