4" Diameter Thru-Wall Tankless Water Heater Vent Kit w-Backflow Stop

Z-VENT Wall Mounted/Sideways Vent Kit for Tankless Water Heaters. 4" Diameter Stainless Steel pipe system. Save time and money with this convenient, preconfigured vent kit for tankless water heaters Kit contains the following components, all 4-inch diameter:1 2SVBFDPA04 Universal appliance adapter with backflow preventer (damper)1 2NVE490 90° elbow1 2NVP41 1-foot length straight pipe1 2NVP41.5   1.5-foot length straight pipe1 2NVWT4 Wall thimble1 2SVSHTX04 Termination hood Note that this kit does not include a condensate drain pipe which may be required depending on your water heater manual guidelines and building code.• This one can replace the first item in this kit because it is a 3-in-1 part (UAA, backflow preventer, condensate drain).• This one with only the condensate drain can be connected to the UAA in this kit. This kit is similar to the 2ZVW04 kit, except the UAA in this kit has the backflow stop. Compatible with many non-condensing tankless water heaters, including the follo