It could be that Flyboy, but it does also have a 'grease nipple' on it and what appears a universal linked shaft through it too, perhaps a control/transfer pump of a shaft powered kind?
..as the shaft if it is that, looks perhaps too big for me, for just a shut-off valve - although it being a very important back up control part (if it is so), operational safety and operating of it would logically require such seemingly hefty shafts.
As bigger diameter tubes can generally be thinner, lighter and can carry proportionally more torque resistance than a more normally sized tube of an equal length...
Certainly it still has some parts codes and stencilling upon it, so those should help specifically in 'tying it' down.