1/2" Fluid Ports 670042 12.0 GPM (45.4 LPM) Operator's ManualSales LiteratureProduct TourGeneral Information ManualView Popular Models FeaturesDesigned specifically for dispensing petroleum-based fuelCompatible with gasoline, diesel fuel, kerosene, aviation fuel, fuel oil and unleaded fuelUsed for high-volume transfer, bulk-unloading or refueling applicationsIncludes a pressure relief valve (per U.L. Specification 79) which restricts the fluid outlet pressure to less than 50 p.s.i. (3.5 bar). How It WorksTo meet UL-79 specification, a pressure relief valve opens and bleeds off excess pressure. The relief valve can be plumbed to return the bleed-off fuel to the storage container.