How does a connection and regulation kit for HVAC terminal units work?

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WHAT IS A KIT FOR HVAC TERMINAL UNITS?

The pre-assembled group for terminal units is compact and able to shut-off, adjust and filter the secondary circuit of the terminal unit. It also allows to perform maintenance and setting operations of the system. It allows the connection of fan coils, cold beams or ceiling conditioning systems with the main distribution network. Complete with insulation suitable for both heating and cooling. Available with Venturi device for flow rate measurement

BUT HOW DOES A KIT FOR HVAC TERMINAL UNITS WORK?

Just watch this video.