Many core parts for the PH2050 are cross-compatible with the PH2045 and PH50F models. Part Number(s) / Description Barrel O-Ring Air Inlet Bushing O-Ring Valve Disc Phenolic replacement (stamped sheet metal originally) Throttle Valve Kit Includes throttle valve, seat, and spring Set Screw ME3F25A (Often functions as an oil filler plug) Assembly & Repair Tips