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