Carlon 3/4 in. PVC non-metallic coupling can be used with Schedule 40 and Schedule 80 rigid non-metallic conduit (RNC). Designed for use above ground and underground as described in the National Electrical Code. Carlon fittings insure raceway integrity. Unlike metallic systems,non-metallic fittings are lighter, can be installed in less time and are easily fabricated on the job. Fittings are non-conductive assuring a safe system. Resistant to sunlight and listed for exposed or outdoor usage, Carlon non-metallic PVC fittings are durable and will not rust or corrode.