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 ¾" connection. With a ½" version you have a flow rate of 38 l per minute. The outlet has a internal thread with ½" or ¾" and the inlet has a ¾" external thread.