This SCH 40 PVC Cap is used at the end of pipe tubing and is meant to seal the end of the pipe. It is durable and impact resistant. Spears Schedule 40 PVC fitting designs combine years of proven experience with computer generated stress analysis to yield the optimum physical structure and performance for each fitting. Material reinforcement is uniformly placed in stress concentration areas for substantially improved pressure handling capability. Resulting products are subjected to numerous verification tests to assure the very best PVC fittings available.