Best Seller | Air Vent Fittings 1 1/2 In 3/8 In (Ptf) | Bundle of 2 Each Air Vent Fittings 1 1/2 In 3/8 In (Ptf). For use on transmissions differentials speed reducers gear housings etc. (above normal level of lubricant)—allows air to escape when internal pressures are built up. Special cap prevents water or dirt from... more | | $13.86 FREE shipping go to store |