Air filters for mechanical purposes; Oil filter adapters; Machine parts, namely, bearings and bushings; Fuel filters; Pressure switches and sensors for monitoring, controlling, and switching hydraulic or pneumatic systems being sold as a unit with manufacturing machines; Parts of oilfield wellhead machines, namely, gate valves, ball valves, check valves, plug valves, globe valves, choke and manifold industrial pumps, pump and valve parts, pipe fittings and flanges; Exhaust manifold for engine...