Mill-Rose 70820 - 3-Wrap Yellow Gas Line/PTFE Thread Tape 1/2" x 260" Full Density (10-Pack) Just 3 Wraps for Leak-Proof Joints! This Product Includes Ten (10) Mill-Rose 70820 Gas Tapes. UPC: 038091708208 Ideally suited for natural gas, propane and butane lines. Use on pipe made from galvanized steel, iron, brass, copper, aluminum, stainless steel, polyethylene, polypropylene, PVC, CPVC, ABS and fiberglass. Do not use Gas Thread Seal Tape on oxygen systems.