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Crane company #52

ELPREZ
ELPREZ Member Posts: 4
I was working on an old Arco boiler circa 1922 that was a gravity hot water system and had a device on one the return legs. It was approx. 12" long and 5" in diameter. It was labeled Heater model 52 and was stamped Crane company on the other side. Anyone know what this?

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