Equalseal Yellow Gas Line Tape is our heaviest tape. Measuring in at 4-mil thick and 1.5 g/cc density, it is the heaviest tape available in the market, and requires only 2-3 wraps to achieve a tight seal. It is ideal for use with natural gas, propane and butane, and can also be used in just about any other service as well, including Oxygen. Equalseal yellow Gas Line Tape is UL-approved for gas line service to300 psig, and can be used up to 10,000 psi in most other services.