Forespar 903018 Marelon 1-1/8" Vented Loop Anti-Siphon Valve

The Forespar 903018 Marelon Vented Loop is a vital safety component for any marine plumbing system, designed to prevent dangerous back-siphoning that could lead to flooding or sinking. This 1-1/8" vented loop is constructed from glass-reinforced Marelon composite material, offering superior corrosion resistance compared to traditional bronze fittings.

Key Features:

• 1-1/8" thread size for secure connection to marine plumbing systems
• Glass-reinforced Marelon composite construction resists corrosion and electrolysis
• Vented design allows air to enter the line, preventing back-siphon effect
• Lighter weight than bronze alternatives while maintaining strength
• Suitable for use above the waterline in head, galley, and engine cooling systems
• Will not deteriorate or corrode in saltwater environments

Vented loops work by creating an air break in the plumbing line when fluid flow stops, preventing water from being siphoned back into the boat. This is especially critical for marine sanitation systems and any through-hull connections below the waterline. The Marelon material offers exceptional durability and longevity in harsh marine environments without the risk of galvanic corrosion.