Forespar 903008 Marelon 1/2" Vented Loop Anti-Siphon Valve

The Forespar 903008 Marelon Vented Loop is a vital safety component for marine plumbing systems, designed to prevent dangerous back-siphoning that could lead to flooding or sinking. This 1/2" vented loop valve allows air to enter the discharge lines when needed, breaking the siphon effect and protecting your vessel from unwanted water intrusion.

Key Features:

• Constructed from glass-reinforced Marelon composite for superior corrosion resistance
• 1/2" NPT thread connections for standard marine plumbing integration
• Anti-siphon valve automatically opens to admit air when pump stops
• Designed for installation above the waterline in head, galley, and livewell discharge systems
• Non-metallic construction eliminates galvanic corrosion concerns
• Durable composite material withstands harsh marine environments

Essential for preventing back-flow in marine toilet, sink, and pump discharge systems, this vented loop provides reliable siphon break protection. Install above the waterline at the highest point in the discharge line for optimal performance and safety.