Vented loops are vital components to reduce the risk of sinking or flooding. The glass reinforced composite Marelon™ Vented Loops allow air to enter the lines preventing that dangerous back siphoning effect. Use above the waterline on your head discharge system, bilge pump, the engine, gen-sets, air conditioners, ballast tanks or other equipment. Vented loops help make sure your boat stays afloat after the pumps are turned off.Specifications Hose: 1" Mount Type: MF844 Size: - Product Details Brand: Forespar Product Type: Marine Sanitation Manufacturer Part Number: 903016 UPC: 028026192974 LNS Category: Plumbing LNS Subcategory: Fittings & Valves Dimensions: H 2 in × W 6 in × D/L 11 in Country of Origin: US Compare the manufacturer part number, dimensions, fitment, voltage, material, and included components with your application before ordering.Enjoy free standard shipping on all U.S. orders, including Alaska, Puerto Rico, Guam, U.S. territories and protectorates, and eligible P.O. boxes.