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