The Truck-Lite Company Inc Jam Nut is the perfect solution for easy installation of 3-part compression fittings in areas other than in junction boxes. Engineered and tested to withstand harsh working environments, this jam nut will provide reliable performance. It meets or exceeds international safety and environmental regulations, making it a great choice for any application. With its gray finish, this jam nut is sure to look great in any setting. FleetPride is your First Click in Heavy Duty®.