nternal connecting cap with lipped perimeter to match up to outside walls of pipe. Slight domed shape on top surface of cap to give a unique, finished look to any design. Creates a finished surface with smooth ends and no sharp edges. Injection molded from 100% furniture grade PVC compound. High gloss non printed surface. Tapered ends on sockets for clean transition to pipe. Considerably more socket depth than plumbing fittings. Impact strength is typically 5 times as strong as plumbing, conduit, and irrigation fittings (based on independent lab testing). UV resistant to maintain integrity and look through years of exposure to varying weather conditions.