apparatus is provided for removing a crimped ring from plastic tubing installed over the nipple of a fitting . a supporting jaw radially supports the crimped ring while a chisel cuts the ring on a tangential path . one embodiment uses pair of levers joined and pivoted intermediate their ends . one lever forms the supporting jaw while the other forms the chisel . when actuated , the cutting jaw cuts the ring on a path tangent to the inside circumference of the ring , thereby avoiding injury to the fitting , the fitting therefore being reusable .