These P-traps have been tested and certified by a third party lab to meet the ABYC weathertight and watertight requirements and ensure no liquid water will reach a fuel vent line, carbon canister or fuel tank. The 1670/1671/1674 P-traps allow air to vent freely during normal sea conditions and washdowns and meet the ISO 10088 requirement for minimum venting area.
For 5/8" / 15mm I.D. hose- see our listing for 5/8" ISO 7840 fuel hose HERE