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Vented loops are vital components to any onboard plumbing system reducing 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.