7371 Underground fire hydrants (0) "Underground pipework for water reticulation systems, with fire hydrants for New Zealand Fire Relates to the design and installation of underground fire hydrants, including; screw-down hydrants, gate valve hydrants, water supply. Public and private fire hydrants." 7372 Fire hydrants for buildings (0) "Pipework reticulation systems connected to the water supply, with inlets for New Zealand Fire Service boosters and outlets for hose connections"