Comparison : Item # 500115, 1-5/16" Opening Size Standard Cylinder Valve Wrench
Item # 500116, 1-1/8" Opening Size Lift Truck Cylinder Valve Wrench
Item # 500117, M.POL Cylinder Valve Wrench
Item # 500137, M.POL Nut
Item # 500137P, Pin for POL Nut