4" PVC Collection Cosmetic Ring for 4" PVC Venting The CR4-PVC stainless steel cosmetic ring adds a necessary aesthetic look to your Noritz venting system, acting as an escutcheon for pipe penetrations. 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. PVC Venting: This stainless steel 4" cosmetic ring is compatible with NRC83, NRC09, NRC1111 & NCC199 series systems. Noritz N-Vent is approved for tankless and boiler stainless steel exhaust installations, enabling you to know you've made the right choice in both form and function. Features: For 4" PVC vent pipe Made of stainless steel Adds professional look to penetrations Easy to install Introducing the latest advancements in tankless water heater technology for your home, Noritz tankless hot water heaters are both eco-friendly and energy efficient, providing savings up to 40% in utility costs. Their gas water heaters warm water on demand, which means you'll always have hot water and it will never run out.