Reddit reviews TEKTON WRN92004 Telescoping Basin Wrench, Extra Large Jaw 7/8-Inch to 2-1/2-Inch Capacity, Long Reach 10-Inch to 17-Inch
We found 1 Reddit comments about TEKTON WRN92004 Telescoping Basin Wrench, Extra Large Jaw 7/8-Inch to 2-1/2-Inch Capacity, Long Reach 10-Inch to 17-Inch. Here are the top ones, ranked by their Reddit score.
Extra large jaw fits 7/8 to 2-1/2 in. diameter nuts and retaining collars on faucets, supply lines, valves, pipes and drain cupsLong-reach telescoping shaft extends from 10 to 17 inches, adapting to any situation180-degree pivoting head holds its position at any angle to access hard-to-reach nutsSpring-loaded jaw automatically adjusts to size and creates a continuous ratcheting action that stays engaged with the nut after each turnRemovable 6-inch, high-leverage handle allows compact storage in drawer or toolbox
One of these, perhaps? Not clear it'll transmit the torque you need. If you can get to it from the side, it looks like the inner end has a standard 1.5" or so hex....
https://www.amazon.com/TEKTON-WRN92004-Telescoping-Capacity-10-Inch/dp/B01D4ZF034/ref=sr_1_1?ie=UTF8&qid=1524174576&sr=8-1&keywords=basin+wrench+tekton