Turns Check Valve Plug. Use a spoon or other tool through slot for more leverage when removing Jet.

This paper introduces the cause of the seepage in valve box of oil isolation pump, and solves the problem of the valve box seepage by way of the improvement of die slot in O - ring and seal material.

It snaps onto the stem and locks into the slot for turning-stops of a ball valve of any material, in place of its standard handle.