GROCO Bronze Vented Loop - 3/4" Hose

The GROCO Bronze Vented Loop - 3/4" Hose is a marine-grade through-hull fitting designed to prevent raw water siphoning into your vessel's engine cooling system. This product is essential for boaters who want to protect their engines from the risks associated with water flowing backward through the raw water line during engine shutdown.

Constructed from marine-grade bronze, this fitting offers excellent corrosion resistance in both saltwater and freshwater environments, ensuring long-term reliability. The vented design allows air to enter the cooling circuit, effectively breaking the siphon and safeguarding your engine from costly water ingestion.

Cruising anglers, weekend boaters, and commercial operators can rely on this vented loop to extend engine life and avoid mid-season repairs. Installation is straightforward—simply splice it into your raw water cooling line between the through-hull and the engine intake manifold, positioning it above the waterline for optimal performance.