Service Kit with Complete Set of Serviceable Parts for Whale Gusher 10 Mk 2 & Mk 3 Pumps (Nitrile)Contains:Valve (Mk 2 pump only) (2)Screw, 3/8" (4)Screw, 1/2" (4)Bridge piece (2)Diaphragm (1)Buffer (1)Valve (Mk 3 pump only) (2)Gasket (Mk 3 pump only) (1)