A 28mm 2 Port Motorised Valve on the Hot Water system that had seized. It’s the original, installed in 2005 so lasted well according to Blowy, my plumber since 2008. Swapped out with a new one in under an hour. Other than the actual boiler and hot water tank, Blowy has changed everything in my central heating & hot water system; it’s the same system we took over in 2005 when we bought the house, but like Trigger’s broom (Google it) it’s not at all original.
Love your plumbers name