Barberi® monobloc is a system component that integrates several functions normally done by more than one component. According to the model, monoblocs are normally used in domestic water systems, heating systems, central heating systems, heat generators (wall-mounted boilers, solid fuel generators, heat pumps), thermal solar systems. The advantages of the monobloc are the reduction of the necessary space, the reduction of the connection quantity (and so of the possible leakages), the reduction of installation time. These products are highly suitable to be installed in industrial pre-assembled units (e.g. water meters or heating recessed installation boxes), in boilers, at the inlet of water supply (before water meter) under basin, to fill heating systems (filling loop), to help other components (for example thermostatic mixing valves). Articles 660F, 663F, 662F, 665F are monoblocs with 90° connection (of different shapes) which include a ball shut-off valve, a filter, a check valve and a drain. The drain can be used to install pressure gauges, air vents, temperature probes.