Valves, cocks, taps and fittings, metal, by type, Metal pipework, valves and containers, Construction, Valves, metal, filling, for water systems, Valves, metal, butterfly, Control valves, metal, Valves, metal, three or four-way, Pipe, tube and hose fittings, metal, Taps and cocks, metal, ball, Valves, metal, plug (plug valves)