Quicksilver 648771 Poppet Valve Diaphragm for Mercury & Mariner Outboards and MerCruiser Engines

The Quicksilver 648771 Poppet Valve Diaphragm is an OEM-quality cooling system component designed to regulate water flow through the engine, helping maintain proper operating temperatures and protect against overheating. This genuine Quicksilver replacement part is engineered to exact Mercury Marine specifications for a precise, factory-correct fit.

Key Features:

• Regulates cooling water pressure and flow through the poppet valve assembly
• Constructed from flexible marine-grade rubber engineered to withstand heat, salt, and pressure
• Precision-molded to match factory dimensions for a drop-in fit
• Serviceable using common shop tools
• Poppet valve diaphragm only — additional parts required for full service are sold separately

Compatibility:

• Select 75–250hp Mercury and Mariner 2-stroke outboards
• Select 75–250hp Mercury and Mariner 4-stroke outboards
• Mercury L6 Verado outboards
• Select MerCruiser sterndrive and inboard engines

Quicksilver is the premier OEM parts supplier for Mercury Marine, with over 65 years of experience producing parts and accessories held to the same rigorous performance standards as original equipment. Refer to your engine's owner's manual or service manual for specific application confirmation and installation instructions.