Non-precious metals and alloys thereof; building materials of metal; pipes and tubes of metal; unidirectional valves of metal; flap valves of metal; retaining valves, of metal; discharge valves [valves], of metal; water-pipes of metal; pipe couplings and fittings, of metal; parts and fittings for the aforesaid goods.

Valves of plastic being other than machine parts, namely, non-return valves and flap valves of plastic for water conduits, valves in the nature of plastic drain traps and plastic valves