Millions of homes and businesses will need Sewer Skewer protection to prevent frozen sewer vent pipes and the resulting methane sewer gas backup.• Keeps all roof vents (sewer, furnace, radon) from freezing up in the winter• Easy installation• Prevents harmful gases from leaking back into your home• The copper conducts heat from the sun• Sewer Skewer XL comes with two 15" screw on extension pipes• Total length is 47 in. long