Attwood 90 P-Trap Fuel Tank Vent - Flush Mount - Black w/Stainless Steel Vent Head [1674-6]90 P Trap Fuel Tank Vent Flush Mount Black with Stainless Steel Vent Head This Attwood 90 Degree P Trap Fuel Tank Vent reliably helps prevent water from entering the fuel tank while still allowing air to vent freely during normal sea conditions and washdowns. This vents effectiveness. eliminates the need for an anti siphon loop in the vent hose. This is a flush mount vent for use with a 5 8 inch interior diameter hose. It requires a 1 3 8 inch