Helix Ptfe Exhaust Sealing Tape The Helix Ptfe Exhaust Sealing Tape provides an efficient seal for exhaust joints, specifically at the intersections between the muffler canister and the headpipe. This is especially useful with slip-on mufflers. However, due to its heat toleration limit of 525 F, the tape should not be used on exhaust ports or engine heads where the heat surpasses this limit. Features: Seals exhaust joints on muffler canister and muffler to headpipe connections (ideal for slip-on's) Not for use on headpipe to cylinder head connection Max. temp 525 F Adhesive backed for easy placement