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.