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so 100% a standard syphon will fit??
eg like the following model from b and q one ?Delchem 8In Dual Flush Siphon, 5397007127676
Probably will do. Only issue is the height of syphon as putting too low a syphon in will mean you will have less max water in cistern & also if it still has an ordinary ball valve then the valve arm can catch on the top edge of a too low syphon.
The bomb part just screws on to ordinary syphons, so no worry there. Just try & get proper bomb for toilet.