Yamada 854452 Pump Part Exploded View Diaphragm, Model DP-50BFE-HD & Air Operated Double Diaphragm Pumps Repair Parts PDF Manual. Air Motor Kit: K45-AM-DP-HD, Liquid Side Kit: K50-ME, Center Body Assembly: 804778, Valve Body Assembly: 804784 Available. Diaphragm, Manifold, Center Disc, Center Rod, Air Chamber, Wave Washer, O-Ring, Ball, Valve Seat, Reset Button, Base, Silencer, Bearing, Gasket, Bolt, Nut.