Pink: used on NPT threads 1⁄ 2 inch to 2 inch, safe for potable water.Yellow: used on NPT threads 1⁄ 2 inch to 2 inch, often labeled "gas tape".White: used on NPT threads up to 3⁄ 8 inch.In the UK, tape is used from coloured reels, e.g. These color-codes for thread sealing tape were introduced by Bill Bentley of Unasco Pty Ltd in the 1970s. It is often used to correspond to color coded pipelines (US, Canada, Australia and New Zealand: yellow for natural gas, green for oxygen, etc.). Thread seal tape used in plumbing applications is most commonly white, but it is also available in various colors. Although PTFE itself is suitable for use with high-pressure oxygen, the grade of tape must also be known to be free from grease. Relevant standards may vary between industries tape for gas fittings (to UK gas regulations) is required to be thicker than that for water. The second standard, A-A-58092, is a commercial grade which maintains the thickness requirement of MIL-T-27730A and adds a minimum density of 1.2 g/cm 3. MIL-T-27730A (an obsolete military specification still commonly used in industry in the US) requires a minimum thickness of 3.5 mils and a minimum PTFE purity of 99%. There are two US standards for determining the quality of any thread seal tape. Typically the tape is wrapped in the same direction the male threads go for tightening, and commonly used commercially in applications including pressurized water systems, central heating systems, and air compression equipment. It also protects the threads of both pieces from direct contact with each other and physical wear, and helps seal and prevent leaks from the connection. The tape also works as a deformable filler and thread lubricant, helping to seal the joint without hardening or making it more difficult to tighten, and instead making it easier to tighten. Thread seal tape lubricates allowing for a deeper seating of the threads, and it helps prevent the threads from seizing when being unscrewed. The tape is sold cut to specific widths and wound on a spool, making it easy to wind around pipe threads. Thread seal tape (also known as PTFE tape, Teflon tape, or plumber's tape) is a polytetrafluoroethylene (PTFE) film tape commonly used in plumbing for sealing pipe threads. The cold doesn’t seem to affect the tape, and we get a few years out of a roll.Thread seal tape is wrapped around the threads, lubricating the connection and allowing the two pieces to be screwed deeper together. Our roll of tape lives in the driveshed, even staying there through the winter. You only need enough tape to wrap 2 or 3 layers over the hose, so don’t rip a huge long piece. After you finger-tighten the connection, turn it the rest of the way with your wrench.Ī consideration with using teflon tape is to wrap it so that when you screw on your hose (or nozzle or whatever you’re connecting) you wrap the tape further around the threads, as opposed to unwinding it. The teflon acts as a lubricant, so that the two pieces of the connection can be screwed together more tightly–this is where the wrench is also helpful. Wind a couple of inches around the threads of a hose–or any plumbing connection–and it helps to make a tight joint that won’t leak. Teflon tape, also known as plumbers’ tape, is a thin, white, non-sticky tape. I keep a roll in the driveshed, along with an adjustable wrench, so that they’re handy every time I’m hooking up a hose or a nozzle. There is one thing that we have bought that helps to prevent leaks–teflon tape. But despite the kinked rubber and the bent fittings, our hoses don’t leak. Unsurprisingly, none of our hoses are in great shape. I even pulled one out of the field where it had been buried in the grass for a few years. We found a few that past owners left behind. I don’t think Matt and I ever bought a garden hose.
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