Designed for horizontally vented water heaters mounted to an outside wall Whether or not you have a tank or tankless water heater, you need to vent with stainless steel or metal pipe instsad of PVC, because of the high temperatures. CAMPLUX vent pipe is crucial for both safety and performance, ensuring that gases are safely channeled outside the building while allowing the water heater to operate efficiently. Exhaust gases: The vent pipe allows the hot, gaseous byproducts of burning gas or other fuels to exit the water heater and move up and out of the house.Safety: The venting prevents harmful gases like carbon monoxide from building up inside the home, where they could be dangerous or even fatal.Pressure regulation: The vent helps maintain proper air pressure inside the combustion chamber of the water heater, which ensures efficient operation and helps prevent backdrafting. Compatible Compatible for MIZUDO Tankless Water Heater 3.6/4 GPMCompatible for FOGATTI Tankless Water Heater 4/5/7.5 GPMCompatible for CAMPLUX Indoor Gas Water Heater CX264/CX360/CX422/CA422/CA528LP/CA528GLP/CA528NG/CA528WLP/CA528WNG/CA686WLP/CA686WNGNOTE: Before you buy, check that the vent diameter of your water heater needs to be less than 3 In Backflow preventer is included for cold climates Pressure Regulation-Maintains Air BalanceContamination Prevention-Blocks Reverse FlowStable Emissions: prevent rain, snow, birds, and other larger organisms from entering the pipe Stainless Steel Vent Wall Thimble Used for through-the-wall chimney installationsProtects the wall as the chimney passes safely through to the outsideCan adjust to accommodate walls from 3.9" to 7.8" thick Include 304 Stainless Steel Pipe Clamps Resilience against wear and tearHigh temperature resistanceHard, not easy to dentNot easy to rust Rain Cap Rain Cap Wall Thimble Wall Thimble Vent Pipe Vent Pipe Kit Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.6 out of 5 stars 46 4.4 out of 5 stars 91 4.5 out of 5 stars 136 4.5 out of 5 stars 136 4.2 out of 5 stars 25 5.0 out of 5 stars 3 Price $19.99$19.99 $29.99$29.99 $49.99$49.99 $59.99$59.99 $49.99$49.99 $229.99$229.99 Diameter Size 3.54 IN 4.33 IN 2.36 IN 3.15 IN 2.75 IN 3 IN Material Stainless Steel Stainless Steel Stainless Steel Stainless Steel Stainless Steel Stainless Steel