Jabsco 1 1/2" Vented Loop

The Jabsco 1 1/2" Vented Loop is an essential anti-siphon safety device designed for marine engine cooling systems. It is particularly useful for boaters who want to prevent water from flowing backward into the engine block when the engine shuts down, which can lead to internal corrosion and costly repairs.

This vented loop operates by allowing air to enter the cooling line at a point higher than the raw-water intake, effectively breaking the vacuum that causes siphoning. Constructed from durable marine-grade materials, it is designed to withstand harsh saltwater environments, UV exposure, and thermal cycling, making it a reliable choice for offshore and coastal vessels.

Ideal for retrofitting older boats that may lack siphon protection, the Jabsco vented loop is typically mounted vertically on the cooling line between the raw-water intake and the engine heat exchanger. Its compact size ensures easy installation without significant plumbing modifications, making it a non-negotiable component for maintaining cooling system integrity.