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pipes.jpg. Be sure you have properly sized your pipe's diameter, either A1/2 inch or A3/4 inch, so that the insulation tubes fit snuggly. Apply duct tape along the slit to create an air seal.

A: Kevin ran into the same thing when he refurbished his 1879 Second Empire Victorian in Alameda. The old pipes were still in the walls - old gas lines, old water lines and old lead drains and vents.