6
Valves of metal, other than parts of machines; Pipes, tubes and hoses, and fittings therefor, including valves, of metal; Valves of metal other than parts of machines including those from alloy steel and titanium
7
Valves; Clack valves [parts of machines]; Valves [parts of machines]; Pneumatically operable valves; Hydraulic valves; Valves for pumps; Lockable valves [parts of machines]; Pressure reducers [parts of machines]; Hydraulic valves [parts of machines]; Valves operated automatically by hydraulic control; Valves [mechanical] for regulating fluid flow; Filters for machines; Filters being parts of machines; Actuators for valves
9
Solenoid valves [electromagnetic switches]; Thermostatically controlled valves; Pressure indicator plugs for valves; Fire protection apparatus
11
Level control valves; Air inductor apparatus [ventilation]; Thermostatic valves; Filters for gas extractors
37
Repair of filters for machines, motors or engines; Maintenance and repair of pipeline systems; Installation of pipework systems; Plumbing installation, maintenance and repair