Abstract: Bottom loading couplers transfer petroleum and other products into tank trucks and the like. It is necessary to replace an annular seal which is held in place by a metallic ring to maintain adequate sealing of such couplers. A circularly symmetrical wrench slides over the ring, extends fingers thereunder and is levered to provide an upward force upon the ring which removes it. After replacement of the radial seal and ring is replaced with the same wrench which exerts a force atop the ring via an opposite application of the levering arrangement.