Grooved mechanical joint is a kind of pipe connection mode that appeared only in 1997, which has improved the construction speed by more than 10 times and reached a perfect level of reliability. Now all the fire fighting systems have adopted this mode. Specifically, a groove is machined on a steel pipe by a grooving machine, and then the steel pipe is connected with a pipe fitting or two steel pipes by a special fixture and a sealing ring, which is convenient and quick, does not damage the galvanized anticorrosive coating, and has strong popularization.

I personally make trench fire-fighting pipe fittings, hoping to help you. ......