The Rinnai 224080PP 39" Vent Pipe Extension is designed specifically for use with certain Rinnai condensing tankless water heater models. This concentric vent pipe extension is made of durable poly material and features a white color. With a diameter of 3"-5" and a length of 39 inches, this extension is lightweight at 4.19 lbs and is compatible with Rinnai brand products. The extension also comes with a California Prop 65 warning regarding potential health hazards. Made in China, this vent pipe extension provides a reliable and efficient solution for extending the vent pipe of your Rinnai water heater.