New valve design,it cans resistance damage from high flow and the pressure of impulse that providing advanced performance. Machined from solid steel barstock for durability. The HTC-SP Series employs a threaded sleeve locking mechanism,mates with matching male threads on the nipple.The two halves must be manually threaded together for connection. New chrome plating treatment provides advanced anti-rust performance . Compatible with GROMELLE 6000 Series and HOLMBURY TGW Series .