Thanks Norm

I was hoping it might be good on that side as it would be hard to reach otherwise.

The ones they sell now have a little primer pump with a metal body which is always an option. At $35 for a primer bulb, I think I will give a outboard one a go.
Just need to work out if I need a 6mm or 8mm. Probably run me under $20

They seem to be an alright little machine - wont get much use though. If it saves the fridges in a long power outage, it will have paid for itself.