the 1670/1671/1674 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.
he 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.