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We get a lot of customers with this familiar problem. You will the sink up with water, ready to do your washing up, you walk away to grab the remaining washing up from around the house, come back and half your water is gone.

If this is you, and your sink is slowly draining of water once it has been filled, but there are no visible leaks underneath the sink – an immediate thought is that there is a fault with the basket strainer waste/plug or seal. A plumber may have already advised that you need a new basket strainer or plug!
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In 99% of cases a faulty basket strainer seal or plug is not actually what causes the water to drain. Follow our easy steps to discover if the issue does lie with a faulty rubber seal and what to do if not.
The basket strainer waste, more commonly referred to as the plug sits in a metal flange. When the basket strainer/plug is pushed down the black rubber seal on the underside of the basket strainer/plug makes contact with the flange forming a seal.
Push your basket strainer waste down as normal to form the seal. Fill your sink carefully with a little water so that it covers just the top of the basket strainer/plug. You DO NOT want the level of water to go over on to the top of the metal sink flange which sits within the bottom of the sink.
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Water will now either drain away or remain where it is. If you discover that the water is draining away then your basket strainer/plug is faulty and you do need a new basket strainer waste/plug or rubber seal. If you are within warranty you can probably get this free of charge, otherwise you can purchase replacements from most retailers – we have them on our site here. As long as the size is correct, they are all fairly compatible.
If you find that the water stays where it is then there is nothing wrong with the basket strainer waste/plug as it is forming the seal needed to contain the water in the sink.
Well, if the water is draining away but not through the basket strainer waste/plug seal then the sink waste has been fitted incorrectly. The water is able to drain away under the metal sink flange as it either has an insufficient fabric or rubber seal or it has been ‘dry fitted’ – fitted without any waterproof seal, such a silicone between the bottom of the sink and the sink flange. The water leaks out underneath the sink flange and travels out through the waste as normal so there is no visible leak even though the water is draining away when the basket strainer waste/plug is pushed down.
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First remove the basket strainer waste/plug and unscrew the centre bolt from within the sink waste and put them safely to one side. You should now be able to remove the metal sink flange by gently pulling or lifting it up, this should then show either an insufficient seal or no seal at all.
Make sure that both the bottom of the sink and top and underside of the sink flange is completely clean and dry. You can then place a small bead of silicone onto the underneath of the sink flange and carefully place it back into the sink waste hole, securing it in position using the centre bolt removed earlier (leave the basket strainer/plug out for now).
Once the silicone seal is dry you can then replace the basket strainer/plug and use your sink as normal. You should now find that the water remains in the sink and no longer drains away when the basket strainer/plug is pushed down.

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As always if you need any further assistance, please do not hesitate to get in touch with our tema on 01527 868 500.The Problem: You fill your sink up with water and it slowly drains away. There is nothing leaking underneath the sink and, therefore, you think the seal on the back of the plug is not working. You may have even spoken to the plumber or fitter – they have advised you it has been fitted correctly and you need to get some new plugs.
The Answer: You firstly need to complete the following test to see if the problem actually lies with a faulty plug seal. We can confidently say that, 99% of the time, the problem is NOT the plug or its seal.
Here we explain the basics of what we are dealing with. The plug (also known as the basket strainer waste) is sat into a metal flange. When you push the plug downwards, the seal on the underside of the plug comes into contact with the flange and creates a seal.
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Push the sink plug down as you would normally to seal and then fill to just over the top of the plug with water. Be careful NOT to put too much water in. You do not want water to go over the top of the metal outer flange and into the sink.
If the rubber seal on the plug is faulty, the water will now drain away and you will need to order a new plug . If the seal is not faulty the water will remain and, therefore, prove that there is nothing wrong with the plug.

We will now explain exactly what the problem is. Basically, if water is draining away, but not through the plug seal, the sink has not been fitted correctly. The water is actually leaking underneath the metal flange due to a missing waterproof seal. In many cases, the installer has either dry fitted the metal flange providing no watertight seal between the metal flange and the ceramic sink. Or it is possible that the installer has used a fabric or rubber seal that is not adequate.
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Start by removing the basket strainer waste plug and put to one side. Unscrew the centre bolt and place to one side. You should now be able to pull off/lift up the metal flange. On inspection, you will either see no silicone sealant on the underneath, a broken ring of sealant or nothing at all. All you now need to do is ensure everything is dry and clean. Apply a small bead of silicone sealant to the underside of the metal flange. Carefully place the metal flange back in place and refix the centre bolt back into place.
Leave the sealant to completely dry (please refer to the manufacturer’s recommendations). Once dry you can put the plug back into position. Fill the sink up with water and you should find it no longer drains away.The kitchen sink basket strainer plug for our double bowl sink had been leaking for a couple of months and it was driving me batty. It made washing up difficult because the water would drain away while washing up the pots and pans. Even more frustrating was when both plugs stopped sealing, so we couldn’t swap the plugs. It’s one of those things you don’t realise is annoying until you have to fill the sink and you can’t. But you soon forget until you need to fill the sink again!
The reason our sink plugs wouldn’t hold water was because the rubber washer underneath needed to be replaced. You can pull apart the plug by untwisting the middle handle part, which allows you to replace the rubber washer underneath. This is the seal that allows the plug to stop water going down the drain. It didn’t matter how I contorted the washer, the plugs wouldn’t keep the water in.
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The only thing that worked, was putting pressure against the plug with my fingers, while the sink filled up. When the sink was ¾ full, I could release my fingers and the plug would seal. I didn’t want to have to do this every time I filled the sink though.
For another temporary fix, you can use a plastic sandwich zip lock bag to act as the seal behind the plug so the sink holds water. Push the plug through a sealed sandwich bag and insert it into your sink drain. You can use the plastic bag a few times before it deteriorates.
Alternatively, if you get jack of the ‘temporary’ fixes, you can head to your local hardware or plumbing store and replace the plugs for new, which is what I did.
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I headed to Bunnings, because I had to get some plants, and enquired if I could get the new rubber seals so I wouldn’t have to replace the whole plug.
Unfortunately, they haven’t been stocked for a while, so most people have to resort to buying a new plug. They cost me under $8 each. You can find the plugs near the PVC traps (bends that are installed under your sink and basin) and plug and waste section. They weren’t in the plug section where I was looking! If you can’t find them,
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