Yamada 852648-FDA Pump Part Exploded View Diaphragm, Model NDP-50BSE-FDA & Air Operated Double Diaphragm Pumps Repair Parts PDF Manual. Air Motor Kit: K45-AM, Liquid Side Kit: K50-ME-FDA, Body Assembly: 803112-XP, Valve Body Assembly: 802971-XP, C-Spool Assembly: 803115 Available. Diaphragm, Manifold, Center Disc, Center Rod, Air Chamber, Wave Washer, O-Ring, Ball, Valve Seat, Reset Button, Base, Silencer, Bearing, Gasket, Bolt, Nut.