Fernco 4" Qwik Cap for capping open cleanouts, pipe ends, and test pipes. The convex face of the cap ensures a secure fit, while the mechanical connection type provides easy installation. Made from corrosion-resistant, flexible, lead-free, and UV-resistant materials, this cap is suitable for non-potable water and sewage applications. It is underground rated and underground use, and has a maximum working pressure of 4.3 psi and a maximum working temperature of 120 degrees Fahrenheit. Backed by a one-year warranty.