Gas Seal Tape is a high density Teflon thread sealing tape coloured yellow to identify it as an approved sealant. Available in 25mm, 19mm and 12mm sizes including a 12mm x 30m 'Tradesman Economy Pack'. Gas seal tape is used on all threaded connections involving gas line installations for natural gas, propane, butane or for water, oil and chemicals - certified to 30,000kPa and is effective across a broad temperature range.