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PVC flue caps are an affordable way to protect today's high-efficiency furnaces from dirt, moisture and other debris. It protects high-efficiency furnaces and reduces draft inducer motor rust. The universal flue cap fits 1-1/2 in, 2 in and 3 in PVC pipe. It helps to eliminate pressure switch service calls, is resistant to UV radiation and oxidative degradation and is CSA approved for use in 90% AFUE heating applications.