help installing polypipe 15mm copper adaptor from 25mm mdpe

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hey I am struggling to work at which way round a couple of washers and grab ring goes on a mdpe to 15mm copper adaptor. I think its a polyfast fitting. I no I put the rubber bush on the copper first. But the it say place one of the washers over this. I dont no whether that is the small or large washer? Then I have a grab ring which which is meant to be placed on so the taper is towards the end of the pipe. What does that mean? Then another washer, I don't no whether that means the small or large washer. I'm ok with all the last bit is just another plastic bush then the nut. Could any one help with whether I put the large or small washer on before the grab ring? Thanks for any help.
 
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I know i put the rubber bush on first. but then is it the large or smaller washer i put on next before the steel grab ring? Anyone used this type or adaptor before?
 
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Only guessing - but I`d say the large one , then the grab ring , then smaller - that way the "lips" on the grab ring will lay in the larger one - and the smaller one will centralise the pipe
 

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