Another thing to check is to turn your old diaphragm over to look at the bottom. Size 32mm (1-1/4"). All red, red & white or all white, this indicates year of manufacture and has no effect of the function of the washer.
Dual Flush Valve Body to Suit Ideal Standard SV93467 1.5" Pneumatic Armitage Shanks EV98167 Without Basket
Armitage Shanks Contour 21 Basin Overflow No Chain Hole 500mm 1 Tap Hole
Armitage Shanks Portman 21 Wall Hung Basin 500mm - 1 RH Tap Hole
Armitage Shanks Sandringham 21 Washbasin 55 cm 1 Tap Hole with Full Pedestal
Armitage Shanks Tiffany Basin Only 510mm with 1 Tap Hole S2081
Armitage Shanks S251301 Orbit Contour Recessed Basin 550mm 1 Tap Hole
