Is it possible to change a plughole without changing the sink?

The plughole is replaceable, they come in two types, one has a large nut which is screwed in place withj a large wrench, the other has a screw on the sink part which extends to the lower part .The screw is tightened quite firm until there are no leaks.I would always advise getting the proper sealing kit, which for some reason is charged seperately, I don't know why.

I know that jel-bleach applied with a nylon scrubbing brush, works fine if left for 2 hours., and scrubbed again

In most cases, yes, you can change the plughole (unless it's a ceramic sink with the plughole built into it). However, you usually need a special spanner which fits the nut underneath the sink (if it's a bathroom sink you may want to remove the pedestal with care - some sinks can fall off the wall without that support if the person who fitted the sink in the first place was a cowboy). Then you need another special tool which slots into the holes in the plughole itself (on the top). Then detach the drainage hose from the plughole (have something to stuff in the hose so you don't get water everywhere). Then wrench the plughole undone. Then remove it and replace it, remembering to squirt silicone gel all around the hole so that you don't get nasty leaks.

As for the black mould, go to a plumbers merchants and they'll give you the stuff you need.

I hope that helps.

You can buy a standard waste separately from any plumbers merchant, you may want to invest in some "silicone eater", the original fitter should have sealed the waste to prevent leaks.

Lithofin do a product called "Mildew Away", I've used it at home and it does a decent job, however I suspect it's basically chlorine based, bleach will probably do just as well.

Remember to wear gloves and not to mix it with any other chemicals (Risk of chlorine gas)

If you are talking about mold in silicone, it's very difficult. I would start with applying some beach to the area and let it sit for 10 minutes, rinse and scrub with soap. If the mold is still there, I would remove the silicone and re-caulk.

It is called a waste fitting, not a plug hole. Yes, it can be changed, but you may find it difficult to do unless the sink is removed to do it, and have the right tools. You may have to have someone in to do this, because any overtightening can crack the china on your sink.

The metal bit is held on with a large nut underneath, but it is also sealed to the sink. If it's just a rubber seal, it should come apart fairly easily. If it's been cemented in, the sink will probably break first.

Bleach will kill the mold, elbow grease and a good rub will get rid of it. Yes, the hole is separate from the sink, so, it can be replaced.

easy job...theres a big nut under the sink that will undo with a pair of "440 channel lock pliers" (adjustable wrench). that will free up the drain under the sink and also the nut that attaches the drain pipe to your "trap". take your part to the hardware store and match it up.............................. as far as the mould goes use common bleach or get some shower spray for mold...

The drain trim usually comes with the sink fixture (faucet). You can also buy them separately. Just unscrew the old one from the little extension under the sink and screw in the new one (clean under it first!).

Use Tilex (or similar) to get rid of mold.

Is anyone here an actual plumber or are you all just guessing? To change the 'plughole' for DIY'ers will mean taking the sink out. Which means disconnecting the water from the taps. Which means turning off the water! How many here actually know where their stop tap is in case of emergency? Do you actually know where to turn off the hot water? my guess is no! A pro will probably sack it off because of difficulties, but if you lot can do better, you're welcome. Leave it to the pro. It will cost less in the end! :)