Leaking sink waste connection ?

Question

I have just fitted a new sink in my cloakroom which has one of these click/clack waste fittings, with the overflow running into the slotted waste fitting The plug fitting drops through the hole in the sink, with a plastic washer between the plug and sink, with another plastic washer/seal that fits under the sink with a large nut to tighten the plug to sink joint. My problem is I cannot tighten the nut enough to prevent water running down the thread of the waste fitting below the sink. I'm guessing that the water is finding a route either between the plug and sink on the top side, or possibly through the lower washer ? Is there a better way of sealing this ?

Thanks Tony

TMC · Accepted Answer

The Medway Handyman · Answer

Buy a tube of Fernox LS-X, apply thinly to all mating surfaces, leave for an hour.

Usenet Nutter · Answer

click/clack ..I presume you mean a popup waste . I have one of those and had no problem with any leakage but I think I dumped the upper washer and used Plumbers Mait to seat it .. As for the large nut underneath I have just had a quick look using a mirror and there is a washer underneath but I have a feeling it is rubber not plastic .I think I might have smeared it with LSX sealant and certainly I have had absolutely no problem with it since it was fitted. Are both the washers you got with the waste plastic ?...is one not rubber .

John · Answer

Concentrate on sealing behind the nut.

TonyB · Answer

The lower one is rubber.So the general consensus seems to be to use fernox lsx sealant/plumbers mait and possibly not use the upper plastic washer either ?

NT · Answer

... or siliconewhat goes on on the upper side makes no difference re leaks. Plasticwashers just spread the load.NT

auctions · Answer

eThe washer between the sink and the plug stops the water draining whenthe plug is down - leave it out and the sink won't hold water,although it won't cause a leak.I prefer using these  the underside rather than using sealant.A

Leaking sink waste connection ?

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