US Patent 7121172 Dual-headed ratcheting basin wrench

A dual-headed ratchet basin wrench for use with compression fittings having a lock nut affixed to a coupling wherein a pair of ratchet jaws rotate to turn the lock nut while a pair of stationary jaws serve to retain the coupling in position thereby overcoming the shortcomings of prior basin wrenches which would turn not only the desired lock nut but also inadvertently turn the coupling and loosen the connection on the other side thereby requiring the user to utilize a second tool to prevent the subjacent nut from turning.