This nozzle holder made of Nylon has a Celcon® valve cap. The back pressure valve opens at 0,5 bar and the max pressure is 9 bar. This nozzle holder has a very high flow rate from up to 57 l per minute with a 3/4" connection. With a 1/2" version you have a flow rate of 38 l per minute. The outlet has a internal thread with 1/2" or 3/4" and the inlet has a 3/4" external thread.