Supports Craftsmen in the installation, testing, calibration, troubleshooting, and repair of field instruments, including transmitters, transducers, controllers, switches, solenoids, relays, control valves, regulators, actuators, positioners, and instrument loops. MPC also owns the general partner and majority limited partner interest in MPLX LP, a midstream company that owns and operates gathering, processing, and fractionation assets, as well as crude oil and light product transportation and logistics infrastructure.