Made of Corrosion Resistant uPVC (unplasticized polyvinyl chloride) AKA rigid PVC, or vinyl siding. Rigid and durable; does not flex; fire-resistant; recyclable. Low Torque, 100% Leak Free Tight Seals manufactured in EPDM, resistant to chemical erosion. Applications: general service, commercial plumbing, irrigation, swimming pools, aquariums, etc.