CVK-H Noritz Concentric Horizontal Vent Kit  The CVK-H standard wall horizontal vent kit is the complete package to complete your tankless water heater venting needs. With a kit including inner and outer plates and everything in between, from elbow, straight and adjustable vent pipe, bird screen and drain tee the Noritz takes care of providing a complete system for you. 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. Standard Wall: This complete horizontal kit package is intended for walls ranging in thickness from 5.8" to 13.2". Noritz uses superior anti-corrosion material for the kit's outlet port, as well as heat and chemical resistant fluorine rubber O-ring for secure sealing. In addition, the kit is part of the N-Vent series so it's approved for tankless and boiler stainless steel exhaust installations, enabling you to know you've made the right choice in both form and function.For all Noritz DVC heater seriesPush-on connectionSingle-wall penetrationHeat and chemical resistant rubber o-ring for secure sealingIncludes inner and outer platesWall thickness range: 5.8"-13.2"