Canton Accumulator ??

What failed, what was the issue?
It's an oil reservoir. It's got a piston compressed against air, so when the oil pressure drops below the charge air pressure(due to oil starvation typically), it pushes oil into the system to balance. You can also use them to pre-oil (or post oil I guess, say on a turbo), with the ball valve, either manual or the electric one. S/F....Ken M