Thexton 423 Universal Radiator Petcock Socket.
Used to open and close petcocks used in radiators, engine blocks, liquid storage tanks, etc. Can be used with 1/4-inch drive ratchet or 7/8-inch wrench. O-ring on socket helps hold wrench in place, allows one hand operation in confined areas. Prevents damage to ears on petcock. Two slotdesign allows for use on all types of petcocks.
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