metal tube and pipe connectors for central heating, metal fittings for steam, pressurized air, water, and gas conduits, and metal pipe and conduit fittings for central heating technology

valves being parts of central heating machines

gas and water meters, hydrometers, hygrometers and thermometers not for medical use for central heating

plumbing regulating and safety fittings, namely, bibbs, cocks, traps, valves for steam, pressurized air, water and gas conduits