Martec Vacuum (Anti-Siphon) Valve 12mm, Yanmar

Martec's 12mm vacuum (anti-siphon) valve is a safe, reliable protective component for your boat's engine. It's designed to effectively prevent siphoning in the engine's exhaust outlet — a phenomenon where, after the engine shuts off, water can be drawn back into the engine through the exhaust and cause severe, potentially engine-destroying damage. The valve is made from corrosion-resistant materials, fully leak-proof, and designed for easy installation even in tight engine bays.

This 12mm model is compatible with Yanmar YSE8-12 (raw-water cooled) and 1GM (raw-water cooled) engines, giving lasting protection that preserves engine function and lifespan. A popular spare part for Yanmar engine servicing and replacing worn-out valves.