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Any definitive answers to the Spiro VS Magnaclean? I'm about to fit one on my own system and am swaying towards the spirovent now!

Does anyone have the part number for the diaphragm for this diverter? I need one of these pretty soon. Also to confirm, only the cold main needs isolating and draining off? Can i take the housing off by removing the two small screws next to the diaphragm?