cast iron concrete pump pipe grooved coupling produced by our company is mainly used for connecting the fire pipe, which makes the connection of the pipe system more flexible. The Grooved Coupling has the advantages of simple installation, convenient, easy maintenance and good effect. Our company is engaged in grooves pipe fittings, fire pipe fittings and grooved coupling and so on with professional quality inspection system, perfect after-sales service team. 1. use high quality 20# steel (40cr).After high-temperature 1200 forging,it’s shaped. 2.High temperature forging,service life is 2-3 times. 3.convenient to use,  easy operation,and high safety. 4.good sealing,wear-resising,longer service life.