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Yes the rubber diaphragm that activate's the spindle to the pressure switch when there's a demand for water. That's not the problemh,it's the other end of the spidnle that goes through to the diverter block it's self that's leaking.

hi new to here but wondering if anyone could help me out, i've replaced a diaphragm on the Diverter on a betacom 30 but when i re-establish the water to the boiler it leaks out of the connecting part of the diverter block, i think the water is passing past the spindle that operates the hydraulic...