Push-fit fittings or Push To Connect Fittings are known for more and more readily available in home improvement centers and hardware stores, due largely to their ease of use. Push To Connect Fittings are a safe & easy choice for the plumbers who has limited confidence to make solder connections in comparison to solvent-gluing CPVC and PVC pipes, or soldered copper pipes. These are easy to use because Push To Connect Fittings don't require heat or welding work, they can be used in tight quarters. Push To Connect Fittings are in high demand because these fittings are quickly and easily removable.
Push To Connect Fittings are available in many materials Inconel 600, Inconel 625, Hastelloy C276, SS 304L, SS 316/ 316L, MONEL 400, BRONZE, BRASS and COPPER Alloy but the 316 stainless steel Fittings are most usable Compression Tube Fittings. Swagelok Compression Tube Fittings and Parker Compression Tube Fittings are most in Demand for high temperature & high pressure applications.
Copper pipes are mainly soldered together, a process called sweating, but they can also be joined with compression fittings.
Solder or Sweat fittings have a nonthreaded joint with a diameter slightly larger than the pipe. when hot solder is applied they slip onto the pipe and the solder seeps into the gap and fix the fitting to the pipe. The soldered fittings play a role as ease of installation for an experienced plumber and permanence. The Solder connections are used by contractors for large size jobs in Industrial projects. If in any circumstances the pipe inserts are kinked or not completely straight then also Solder connections will last as long as the pipes, which is not applicable for Push To Connect connection because the threads and the ring of these fittings are subject to corrosion over time. For obvious reasons we should never use a soldered fittings to join copper gas pipes.
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