The precision-made Tork 5500 turn-lock shorting cap is a secure method for closing primary circuits. This convenient NEMA locking-type receptacle is calibrated to work for all voltages, and its top quality construction makes it a tough product meant to resist the elements. The gasket is made from durable material, making it long lasting and providing secure, weatherproof protection. There is no other choice for an all-around, top quality shorting cap that provides security and reliability in any weather. Note: Not compatible for LED fixtures.