... .waterproof grade: IP67, 3.long life time, Materil:waferproof vent plug waferproof vent plug:1. Grade: IP67.2.waterproof,but air can ... &outside.4. material:ePTFE Main advantages of ePTFE screw-in vent:1, reduces the pressure on the hermetic of the device ... case;4, simple installation ,long working time. ePTFE screw-in vent is widely used in: LED outdoor lamps, LED street lamps ...