Peak Industries began with a simple vision — a need to protect flue pipe vents from outside elements that could affect the proper venting of high-efficiency gas furnaces. Our unique design allows one cap to fit the most common 3 sizes of the PVC pipes used. We were able to accomplish our mission after receiving our patent to market the e-cap. HVAC manufacturers, including Goodman, Amana, Daikin, York, Fraser-Johnston, Luxaire, Coleman, Bosch, and others, tested the E-Cap with nothing short of superlative results. Thus, the E-Cap has become a prominent fixture in the HVAC industry.