50510000 Repair and maintenance services of pumps, valves, taps and metal containers Repair and maintenance services for pumps, valves, taps and metal containers and machinery
50532000 Gwasanaethau atgyweirio a chynnal a chadw peiriannau a chyfarpar trydanol a chyfarpar cysylltiedig Gwasanaethau atgyweirio a chynnal a chadw peiriannau