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- Sterling thermostatic bellows for 1/2" and 3/4" 7-50, 7-70, and 7-80 series (with stainless steel trim), as well as M7-50A, M-7-53A, 8-50A, and 8-53A radiator traps. Thermostatic bellows are sealed liquid-filled capsules that close to keep the steam contained in the heating apparatus and open to allow the discharge of air and condensate when it cools.
- Suitable For Use WithM-7-50A, M-7-53A, 8-50A & 8-53A TrapsManufacturerACS GroupManufacturer #693-10979-01