Filling and purging of recouperators is a weapons tech responsibility, and not that of the users. It is not simply a case of "fillerup". These would not have been issued on the scale of one per gun.
Some of the 25 pounder tools for the guns are still in use today on the 105s. I have a couple of the quick release tools for doing the drawback, and as well, some of the weapons guys have related to me getting old pumps like the one you linked to out of the supply system.
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