Air to Close Spray Valve, Aluminum, 3" Grooved Ends, 1 8" FNPT Air Port, UnitedBuilt AV1100F UnitedBuilt M3ZRM B82468MS Female NST (NH) 1 1 2" 0004330 Female NST (NH) 1 1 2" Replacement or New Installation For mounting arrangements designed to accept this pad’s dimensions and construction lightweight A380 die cast aluminum Air to Close Operation Provides responsive pneumatic control of water flow to spray system circuits Reduced Water Hammer Controlled valve closure helps minimize hydraulic shock to the pump and plumbing system Internal Closing Spring Keeps the valve seated under static water pressure when the truck is shut down and control air is depleted Serviceable Diaphragm Assembly Replaceable urethane seal and internal components simplify maintenance and extend service life 3" Grooved Connections Allows fast installation and servicing with compatible grooved couplings Flexible Installation Suitable for inline control valve or end of line spray valve configurations Made in USA Designed and manufactured in the United States Specifications providing the strength required for severe water truck service while keeping the assembly lightweight