The design specifications for automatic sprinkler systems clearly state that system pipeline connections should utilize grooved connectors or threaded and flanged connections. For pipes with a diameter equal to or greater than 100mm in the system, flanged or grooved connectors should be used in sections. Grooved pipe connection technology, also known as clamp connection technology, ha... https://www.furdfittings.com/what-are-grooved-pipe-fittings/