... grade: IP67, 3.long life time, Materil: ePTFE ePTFE pressure balance plug :material:ePTFE breather plug1. Grade: IP67.2.waterproof,but ... through, 3.equalize the pressure inside&outside. Main advantages of ePTFE pressure balance plug:1, reduces the pressure on the hermetic of ... device case;4, simple installation ,long working time. ePTFE pressure balance plug is widely used in: LED outdoor lamps, LED ...