Cutting heads for power operated waterjet cutting equipment; replacement parts for power operated waterjet cutting equipment, namely, nozzles, orifices, alignment inserts, housing inserts, adaptors, valves, tubes, water jet nuts, threaded discs, and seats; water pumps and replacement parts for water pumps used in power operated waterjet cutting equipment, namely, seals, hoops, back-ups, cylinders, stems, seats, rings, bearings, caps, poppets, springs, adaptors, tubes, pins, filters, and needles; abrasive regulators for use with power operated waterjet cutting equipment; abrasive pots for use with power operated waterjet cutting equipment