Leaking Basin Waste


I am having a real problem fitting a new waste to a new small basin.The waste is the one with a slot in the side for the overflow.Problem is try as I might it leaks. I have fitted it with plumbers mate under the plug hole end and then between the rubber washer and the sink underneath so the large nut squeezes the putty into the gap.In fact I have remade this about 6 times so far and it either drips when empying or trickles when overflow tested.
What am I doing wrong?
I tried the washers given with the waste which were a flimsy white one for the top and a sturdy black one for the bottom and they didnt work so the supplier said use pumber mate instead.
Any suggestions gratefully received.
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You need a tool to tighten this, hand tight is not good enough. If that does not do it then take off the rubber washer and clean off all the sealant from the washer and the basin. buy a polythene waste washer( a few pence) and put it between the large nut and the rubber washer.
What often happens is the friction of the big nut tightening against the rubber twists and distorts it, especially if the rubber washer is on the narrow side.
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Do you mean not use plumbers mate at all at the bottom just rely upon the black washer?
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If I was doing the job then I would do away with the rubber washer and use only the poly washer. I would then use plumbers mait or silicon sealer between the washer & basin.
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all circumstances and there is a certain amount of controversy as to it's long term effects when in contact with plastic.
I had exactly the same problem. A good clean, making sure all contact parts are dry and an application of silicone sealant in the appropriate places did the trick first try for me. Hope it does for you also.
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"Capt T" wrote:

Clear silicone sanitary sealant normally does the trick.
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waste. Fit, and nip up the big nut just finger tight. Once the sealant has gone off, nip up further with a spanner.
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