Standard 1/8"NPT size for Paint ball or for PCP Air Rifles Female socket fitting supplied with 1/8 NPT male thread with cone for connection to a micro bore fill hose. Can be used between micro bore hose and SCUBA cylinder charging fitting. Manufactured by CNC in Stainless Steel to produce a strong reliable product. Max working pressure 400 Bar Secure six ball locking mechanism Compatible with others on the market.