Connecting 40mm pipe to 1.5" dual flush valve

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I need to connect a 1.5" dual flush valve outlet to a 40mm water pipe leading to the toilet bowl, but can't see how to do that.

I'm replacing an old valve that has a 2" outlet which this new one says it's compatible with, but that just seems to refer to the alternative washer it has that fits in a 2" outlet hole in the cistern, which is no help in connecting to the pipe.

I tried taking the screw end / washers from a 40mm compression fitting but the threaded end of these are wider than 40mm so it doesn't fit onto the valve's outlet.

Any ideas what I can use instead? Only options I can think of are load it with loads of ptfe tape, or buy a new 2" valve, but the fact that the one I have is supposed to be compatible makes me think i'm missing something obvious.

Thanks
 
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CBW

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I think compatible ones come with different bayonet fittings iirc. What valve is it? Why jot just get another 2 inch outlet one?
 

CBW

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maybe it just means that it fits in a cistern with a 2" outlet hole, not that it will connect to the existing pipework

Yes, this it what this means on this valve.
 
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