Poppet valve diaphragm 648771 is an essential component for maintaining the cooling system of select 75-250hp Mercury and Mariner outboards. Produced to Mercury Marine original equipment manufacturer specifications, this diaphragm ensures the proper regulation of water pressure within the engine's cooling passages. Regular inspection and replacement are key to preventing engine overheating and performance loss.
- Fits select 75-250hp Mercury/Mariner 2-stroke, 4-stroke, and L6 Verado models
- Compatible with various MerCruiser inboard engines
- Critical component for regulating cooling system water pressure
- Easy to replace with common shop tools during routine service
- Poppet valve diaphragm only (additional hardware sold separately)
