Thank you for your quick reply. I thought the same way, i.e. on top.
However, as Bristan is a well known and respected manufacturer of taps, one would think that they would have done some research on the subject and put out instructions that were fitting for a quality manufacturer. This has somewhat created some doubt in my mind as to weather or not each product was designed to be fitted in a way it was designed to be.
This is the reason for my post, to find out from experienced people. Thank very much again for your reply.
I’m gonna ask a silly question....does the tap not have a built in oring for the top sink surface?
You’re gonna need a washer/tophat underneath to stop the nut coming loose.
If you fit the supplied/designed for below sink washer above sink, it’s gonna look crap. It won’t sit center while you tighten the tap.
If no oring, treat the tap tail like a sink waste, big old snake of putty around it, washer underneath and tighten it up!
Hi Timmy, Thank you very much for your reply. The tap does not have an O-ring. The tap mating surface that fits on top of the sink is polished chrome. On a similar thread, I read one person's opinion that a rubber washer underneath a tap was there to stop the tap turning, however, on tightening the brass backnut the rubber washer would be dragged out of shape when the nut was tightened. I thought about putting the rubber washer underneath the sink and a white nylon washer next, followed by the back nut to avoid this.
It could possibly look crap placing the washer at the top, especially if it compresses and part of it comes out to the side. I want to avoid this after purchasing quality taps. I thought about using a nylon washer here instead of rubber one.
As I have a ceramic sink, I think the centralising washer/top hat washer would be suitable for this type of sink, as you suggested to stop the nut coming loose.
I have some plumbers mate in my plumbing box, but I am a bit unsure of using it in this situation due to it tending to dry out. I also understand that it can get under the seals and have an adverse effect on them.
Thank you very much for the advice it is very much appreciated. I will weigh up all the advice given at the end of this thread.
Take care, JohnnyB.