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I'm waaaaay late heading to the hanger, but I just thought about an old aluminum air/oil separator that I have at the hanger. I'm thinking it might make a good expansion tank/sensor vessel. Made a note to dig it up and look at it. I'm off.
Rusty
Old Volvos (& many other cars) use pressurized expansion tanks for the rad. & you can see at a glance where the coolant level is during preflight.
Discarded small fire extinguisher bottles can work well & they are probably free from most fire protection companies. Dryer bottles from auto a/c systems will work too.
Charlie
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