Petersen Products 140-4 Series pipe protector plugs are designed to keep all types of pipes clean and protected. They have ABS / stainless steel construction to resist corrosion, chemicals and wear. These plugs are easy to use and can fit into pipes ranging from 6 to 60 inches. They feature a neoprene gasket for heat resistance and enhanced flexibility. These tamper-proof pipe plugs have operating temperatures up to 180 degrees F and a 5/32-inch Allen wrench for their easy installation & removal.