Replacement parts for oil-well pumping machines, namely, valves, casing hangers, casing heads, tubing heads, tubing hangers, coiled tubing connectors, chokes, and flange protectors; remote underwater oil well pumping machine completion systems comprised of wellheads, remote flowline coiled tubing connectors, remote coiled tubing connectors and oilfield equipment in the nature of Christmas trees comprised of pressure gauges and safety valves for flow shutoff in oil well construction