The PETOL REFINERY WRENCH is a combination pipe wrench/valve wheel wrench designed for multiple uses in the refining, petrochemical, and gas processing industries. eel wrenches are also available with SURGRIP style valve wheel wrench opening to further reduce slipping. WARNING! Protect yourself and others from SERIOUS INJURY! Never use a cheater or other means to extend handle! If wrench slips you can be hurt or injure other workers!