Abstract: A device for safely rotating the wheel of a large or hard-to-turn valve is disclosed. The wrench comprises an elongated handle, and a wheel grip. The wheel grip further consists of a rim grip and a spoke grip. The rim grip extends upwardly (when viewed from above) around the bottom of the rim of a valve wheel. The spoke grip extends downwardly, first around the rim of the wheel, then inwardly, so as to grasp the spoke of the valve wheel.

Abstract: The present invention is an improved mud excluder fitted around a rotating acoustic transducer of a borehole televiewer to exclude mud from the borehole televiewer. This mud excluder has:(a) a flexible casing means attached to the borehole televiewer to form a fluid cavity adjacent to the rotating acoustic transducer,(b) an acoustically transparent fluid located within the fluid cavity,(c) an acoustic window means opposite the transducer and adjacent to the fluid cavity, and(d) a pressure compensating means within the fluid cavity to equalize the pressure within the fluid cavity with the pressure on the outside of the flexible casing means.