E121 21 June 2024 by admin E121 Automatic Air VentFeatures :With the Z121 A shutoff valve fitted, cleaning or re-placement of the seal and inner components can be carried out without draining the system.Operating temperature max. 110°C (230°F)Operating pressure max. 10 bar (145 P.S.I.)Connection sizes R 3/8″ and R 1/2″