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Blanco Supreme 533-U sink drain leaking at seal

The drain unit on our Blanco Supreme 533-U is leaking from around the rubbery seal between the sink and the plastic (white) drain unit (under sink). Is there a way of tightening up the seal between the sink drain and the plastic drain unit? I seem to have lost the Installation Instruction for the sink and drain unit, does anyone know if there is a copy online anywhere. Thanks for any help you can give. PS. I did see a simular question, and answer, on this site but that didn't refer to the plastic type drain fixing.

Posted by paulcun on

  • 1 more comment 
  • paulcun Jan 16, 2012

    Thank you for your reply.

    But in the case of this Blanco sink, the only nut under the sink is the one that attaches the plastic down pipe to the plastic unit (basket/strainer?) under the sink. If this nut is removed the plastic unit is still attached to the sink: I can not see how this unit is removed so I can get to seal between the sink and the plastic unit (where it is leaking from). Any ideas?

  • martin parker
    martin parker Nov 30, 2013

    Paulcun, I apologise for repeating myself - i have also posted a coment to your similar post on another site, but thoght that I would ask here as well in case you don't see that one. Were you able to solve your problem? I have exactly the same problem. And the people who kindly replied to your question did not quite address te real problem - getting the basket off the sink.

  • Eamon
    Eamon Mar 06, 2014

    Hello Martin Parker. I now have the same problem. Did you manage to fix yours?



1 Answer

John McPherson

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The sink basket/strainer that fits into the large hole of the sink should have either a bead of silicone sealant applied to the sealing lip of the assembly or a ring of plumbers putty. Silicone will work very well if the mating flanges are clean and dry.

With the baket in place, the rubber seal goes between the large nut and the sink. A bead of silicon on this is optional on the sink side of that rubber seal. and the nut tightened down snug , forcing some of the silicone out fro beneath the mating flange and rubber seal. Tight enough so the basket is not free to move. Be it plastic or brass/metal, that order is the same, only a plastic nut is not tightened as tightly as a metal nut would be.

On the bottom of the drain basket assembly there is a nut, to retain a plastic or brass tail piece. The plastic tail piece will have a polyetheylene "flanged washer" for a seal to the bottom of the sink basket. If it is a brass tailpiece, a rubber seal and metal nut is used with "pipe dope"/thread sealing compound used on the threads of the metal nut. With the plastic nut, you can apply a few wraps of teflon tape to the threads of the drain basket, but is not required in most cases as the poly flanged washer will form the seal. The plastic nuts should not be tightened any more than hand tight.

beneath that, the rest of the drain assembly attaches. If plastic- no more than hand tight. if metal, only about 1/4 turn past hand tight. Metal nuts and parts should use rubber gaskets/seals and the plastic parts should only use the poly tapered/lip seals.

Posted on Jan 16, 2012

  • John McPherson Jan 16, 2012

    If your sink was cast as a single piece to include what is normally the sink basket, as part of the sink with only the 1 1/2 inch connection, there should be a thin flanged gasket between the flange of the thin pipe of the drain and the sink itself, and a rubber seal on the bottom side between the nut and the flange of the pipe. or alternately if you have a wide rubber flat gasket it should be between the flange of the drain pipe and the bottom of the sink. That stub of thin drain pipe sometimes does not get held tight due to how the nut was made and sometimes you need to use an O-ring to take up that space and support the flange..

    If that assembly of 2 seals in the first case is too thick to allow the nut to thread on the sink, an O-ring seal can be used in place of the rubber gasket to achieve the seal. 3 or 4 wraps of teflon tape or pipe sealing compound (pipe dope) should also be applied to the threads of the sink. That should address the leak.

    t cast with the sink, it may be siliconed in place, and does not have a nut on it. There are some the also clamp to the bottom of the sink The basket is nominally 4 inches across. if it leaks, the silicone seal was likely broken by later tightening of the nut or clamping assembly that rotated the basket. I am only adding this last part for benefit of someone who may have that setup inthe future.



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