The automatic filling unit is a device consisting of a pressure reducing valve with compensating seat, an inlet filter, a shut-off valve and a check valve. It is installed on the water inlet piping in sealed heating systems, and its main function is to maintain the pressure of the system stable at a set value, automatically filling up with water as required. This product has the characteristic of being pre-adjustable, which means that it can be adjusted at the required pressure value before the system charging phase. FEATURES Pre-adjustable automatic filling unit. Anti-scale. Visual system pressure setting indicator. Complete with manual shutoff valve. Strainer and check valve. Maximum inlet pressure: 230 psi. Maximum working temperature: 150°F. Setting pressure range: 3 - 60 psi. Preset outlet pressure: 15 psi.