The petol refinery wrench is both a pipe wrench and valve wheel wrench in one. The valve wheel wrench is used in gas processing, petrochemical and oil refineries.
Valve Wheel Wrench
A valve wheel wrench has a U shaped opening on one end that grips a valve wheel and reduces slippage when working in tight spaces or overhead spaces. These wrenches have become a necessary part of anyone managing large facilities. These valve wrenches go by other names as well, such as: