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Bell-Gossett (english metric)
Bell & Gossett - Pumps, valves, heat exchangers and accessories for plumbing, wastewater and HVAC
no. 87, 67 and 7 automatic air vents english metric
https://bellgossett.com/hydronic-plumbing-accessories/air-vents-2/no-87-67-and-7-automatic-air-vents/