Basin waste - what sealer do I use?

"diy-newby" wrote

The last one I bought came with a foam(ish) sealing washer. A thin smear of silicone on each side of this for good measure and Bob's your doodah.

Phil

I recall reading that it is essential to seal between the nut and the bottom of the basin - otherwise it may leak when emptying or if water goes into the overflow.

Clear silicone sanitary sealant.

This thing compresses a thick rubber bung which fills and seals the threads, so none is needed.

Seconded!

No sealant required = famous last words.

Ensure faces dry, clean and grease free before applying only as much as needed.

Thirded!

Indeed. Silicone it first - it will save taking it apart to silicone it after.

Yes, they are great. I always use them when replacing a waste outlet. Also(to the OP), dont even think about using a 2 piece waste (the bit you see in the sink, where the strainer is screwed on separately) as they start leaking too easily - you tighten up the large nut on the bottom, it then stretches the plastic bit in the sink, and the metal strainer can start to come loose. A quick look on Screwfix and Toolstation shows none of this type on sale, though they are available from B+Q et al, and are s**te.

Spend £1 more for a 1 piece waste like this one here:

No need for any sealant at all when used with the Basin Mate. Alan.