The application and characteristics of products: Single modular brass return manifold with prefitted seal and lock nut. Built in control valves, thermostat adaptable with electrothermic actuators series 22C. Side outlet connections : 3/4" M EURO-CONE. Male/female head connections : 1" - 1.1/4". Differential pressure : 1.5 bar. Kvs of outlets : 2.28.