Inject Head also can be called as brass plug, sounding head, sounding pipe head. There are type A, type B and Type C. Type A is the inject head for steel deck, Type B is the inject head for wood deck, Type C is the lift inject head.
The inject head must pass the seal test with the water pressure 0.11Mpa, and last for 5minutes.
Standard: CB/T3778-1999, JIS F3002