Compatible with 4-inch PVC drain, waste, and vent piping, this heavy-duty test cap provides reliable sealing for plumbing systems. Made from durable PVC, it can be solvent-welded to ensure a secure fit. The cap is designed to withstand testing pressures of up to 40 feet of water or 17 psig, making it suitable for various applications. Its unique design prevents it from falling inside the pipe and causing clogs. Available in a convenient 25-piece bag, it offers an efficient solution for plumbing projects.