Forespar 903011 MF 839 Vented Loop 1-1/4 Inch Marine Anti-Siphon Valve

The Forespar MF 839 Vented Loop is a 1-1/4 inch anti-siphon valve designed to prevent unwanted fluid transfer between tanks in marine plumbing systems. This essential safety component is commonly installed in marine toilet systems and engine cooling systems to eliminate siphoning when systems are not in use.

Key Features:

• Simple valve system allows air to enter the line when not in use while effectively sealing as fluid passes through
• Duckbill one-way valve design seals properly even when particulate matter is present in fluids
• Molded in Marelon for superior corrosion resistance in marine environments
• Both vent and loop components will not corrode or degrade from saltwater exposure
• Compact design fits easily into tight engine compartments and plumbing runs

Specifications:

• Barb Size: 1-1/4 inch (28.57mm)
• Height: 7 inches (177.8mm)
• Width: 9 inches (228.6mm)
• Material: Marelon (glass-reinforced composite)

Installing a Forespar vented loop provides reliable protection against backflow and siphoning, ensuring your marine systems operate safely and efficiently.