Attwood Marine - Fuel Tank Vent - 90-Degree Flush Mount - for 5/8" Hose - Stainless Steel - 16746. These vents help prevent water from entering the fuel tank, yet allow air to vent freely, during normal sea conditions and washdowns. This eliminates the need for an anti-siphon loop in the vent hose. Meets ABYC Standard. Installs easily and permanently. Made of flame-retardant black plastic with choice of black, white, or stainless steel vent head/cover.. Features:. Type - Stainless Steel. Hose - 5/8" Inside Diameter. Max Hull Thickness - 1/4". Hole - 3/4"