Forespar Marelon 3/4" Vented Loop/Siphon Valve HA5505 They mount vertically or horizontally

They mount vertically or horizontally for low-profile placement on steps

For select 135-250hp Mercury and Mariner 2-stroke outboards

Mercury-Mercruiser 848 NLA

8M0142649 Mercury Marine Sensor Wif Drain

Forespar Marelon 3/4" Vented Loop/Siphon Valve HA5505 They mount vertically or horizontallyVented 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