CVP-12STR Noritz Concentric 12" Straight Vent Pipe The CVP-12STR 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.12" Straight Vent Pipe