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So there is this new megatape that's grey and rated for gas, code says it has to be pipe dope or yellow tape, anyone know if it's approved by code to use for gas ?

It's not approved for natural gas in Ontario.

B149-20:
CAN/ULC-S642-07 Standard for  Compounds and  Tapes for  Threaded  Pipe Joints

Oatey yellow gas tape is ULC s642-07 approved

The megatape:  APPROVALS & LISTINGS CUL Listed (MH20734)


FAQ for megatape:
Q  Is Oatey White General Purpose thread seal tape safe to use on natural gas lines? A  Yes. All Oatey thread sealant tapes will work on natural gas lines. Oatey does, however, recommend the use of yellow gas line thread tape with PTFE on all natural gas line installations, product #31403. The Oatey yellow gas line thread tape is approved by code for this application and the yellow color is a visual identifier that the correct tape was used in the application.