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When fitting a set of taps I was always taught (many moons ago) that the rubber washer went topside i.e the tap sat on the rubber washer and then the backnut was tightened up. I come across alot of sets of taps where the taps are not sat on anything and the washer is underneath, with the backnut tightened in to the washer. I have also read fitting instructions where it tells you to put the washer underneath. I cannot see the point of this as when the washer is underneath it prevents you from tightnening the backnut tight enough and can also split the washer.

So the question is when fitting taps should the washer go on the top or bottom??

uug197h

I agree the tap should sit on the washer but a lot of the new taps just have 1 washer to go on the nut, I have a box of O rings and some times use them for the tap to sit on but that’s a personal choice. I know plumbers that say if you don’t get it with it, it doesn’t need it

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ProffesorPlumb

Washer under the tap and then the back nut under the sanitary ware etc.

Like uug197h, I carry a boxful of washers just in case.

2true

you could always use a fix a tap seating kit. work well all the time