The Cvp-4Str is a finely finished durable stainless steel vent line for sturdy connections where you've got your measurements dialed in. This vent line has a simple push on connection, anti-corrosive and heat resistant connections, and is compatible with all heaters from the DVC series. 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. Vent Line: Utilize the CVP vent line to stretch from your DVC series tankless water heater to your exterior destination. The durability and strength of it's stainless steel design is paired with its single-wall penetration construction and ease of install design making it the perfect fit in almost any circumstance. In addition, the kit is part of the N-Vent series so its 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 all Noritz DVC heater series Push-on connection Single-wall penetration Heat and chemical resistant rubber O-ring for secure sealing 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.