Pump Holder Seal Compatible with FS-70U - OS44714200 by O.S. Engine  [OS44714200]

Pump holder sealing gasket for FS-70U

This pump holder gasket is an OEM-fit replacement for FS-70U engines used in RC models. It provides the sealing surface between the pump and engine case to preserve fuel delivery and avoid leakage that can affect engine behaviour.

Practical fitting advice: clear away any old gasket remnants, confirm the pump flange rests flat, and use progressive, even tightening to avoid crushing the gasket. The item is purely functional, aimed at reliable sealing rather than altering power output.

View this gasket as a routine consumable in engine upkeep. When installed correctly it assists consistent fuel feed and simplifies tuning and fault diagnosis by removing sealing as a variable.