... waterproof grade: IP67, 3.long life time, Materil: ePTFE ePTFE pressure balance plug :material:ePTFE breather plug1. Grade: IP67.2.waterproof ... the hermetic of the device case by the fast pressure balancing;2, protects the components inside from water, cleanser and ... case;4, simple installation ,long working time. ePTFE pressure balance plug is widely used in: LED outdoor lamps, LED street lamps, under ...