... , 2.waterproof grade: IP67, 3.long life time, Materil: pressure respirator pressure respirator:1. Grade: IP67.2.waterproof,but air can go ... . material:ePTFE Main advantages of ePTFE screw-in vent:1, reduces the pressure on the hermetic of the device case by the ... -in vent is widely used in: LED outdoor lamps, LED street lamps, under-water lamps,automobile lamps,landscape lamps etc. pressure respirator ...