MYSON MPE322 3 Port MID Position Valve
City Plumbing
The Potterton diverter valve is a part that only appears in combi boilers. It allows the hot water to be directed to the central heating (radiators) or to the hot water system (taps). This is what makes combi boilers so popular.
AmazonMyson MPE3223 Port Mid Position Valve VALVE, Manufacturer: MYSON