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These 1-Hole 1/2" strain reliefs provide a waterproof entrance or exit for wiring on PV module junction boxes and outdoor combiner boxes. The hole is 11.4mm sized for the most commonly used cables. These strain reliefs are made of Nylon with Buna-N seals. Resistant to salt water, weak acids, weak alkalis, alcohol, ether, esters, ketones, and mineral, animal and vegetable oils. Non-corrosive, suitable for direct burial installations. UL Listed and suitable for use in NEMA 4, 6 and 12 applications.