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Like there are rip-offs and RIP-OFFS I suppose! The Baxi part turned out to be just the venturi bit (spring, cage, plunger etc.) so the price comparison wasn't actually like for like. However, that's all I really needed and it fitted the Alpha housing fine, so they are the same part. An...

Thanks for all the replies, I've decided to risk it and try the Baxi part first as it is only £8.85 for the complete assembly (Incl VAT). The equivalent Part Centre price for the Alpha part is £52.67, although now I know the correct part number, I was able to find it for half that price. I...

Thanks again Agile Tony. I think the insert was blue (memory's not what it was). The missing cage might well have been plastic. The spring is there, but no sign of any plunger or 'O' ring. It takes three times the minimum flow in the manual (2.5 l/m) before the diaphragm plunger operated the...

Tony, Thanks for the quick reply. The plastic restrictor is still there as its held in by the brass 'screw' part. It's the bit on the end of that which is broken off (it has four thin bits of brass connecting it to the main body). I only know it should be there from the exploded view in the...

Hi, My mum has just moved house, and her DHWater only heats up if the tap is turned full on (flow rate 7.5 litres/min). I've already replaced the diverter diaphragm, but that made little or no difference and the old one looked OK any way. I removed the differential pressure assembly to check...