Utilize the RC4 4" rain cap to provide an aesthetically pleasing stainless steel finish to your tankless water heater venting system. The optimum choice for roof vent terminations, it provides a durable rain protective barrier to continually allow for a safe properly functioning system. As part of the N-Vent series, this product is UL approved category III venting, and is an integral part of the quick-snap connection system, known for easy installation and forming tight seals.