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678 Three-way zone valve with by-pass tee for thermo-electric actuators 6563, 6561, 6562 and 6564 series | Caleffi International
![678 Three-way zone valve with by-pass tee for thermo-electric actuators 6563, 6561, 6562 and 6564 series | Caleffi International 678 Three-way zone valve with by-pass tee for thermo-electric actuators 6563, 6561, 6562 and 6564 series | Caleffi International](https://www.caleffi.com/sites/default/files/styles/product_photo/public/file/678050.jpg?itok=J2_gibvu)
678 Three-way zone valve with by-pass tee for thermo-electric actuators 6563, 6561, 6562 and 6564 series | Caleffi International
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