WHEN PRESSURE DEMANDS QUALITY

metal valves not being parts of machines, namely, gate valves, ball valves, and parts therefor

Parts of oil and/or gas wellhead machines, namely, [ tubing head adapters, flanges, casing heads, ] cross and tees, [ tubing head threaded bottoms, ] tubing heads [, tree cap bottom hole test adapters, and parts therefor ] ; machine valves, namely, gate valves [, ball valves, and parts therefor ] ; hydraulic valve actuators and parts therefor [ ; pneumatic valve actuators and parts therefor ]