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I accidentally lost a small screw into my sink. This screw is a special screw for a toilet paper holder and cannot be replaced easily.

The sink has this L-shaped tubing with a large bottom part in it. I think it’s called a bottle trap (see picture 1). I was thinking that I could unscrew the connector nuts and get the small screw from he bottle trap. Is that feasible and if so what precautions should I take to protect the tubing and bottle trap?

toilet sink bottle trap

The connector nuts are like this: connector nut 1 connector nut 2

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    Take it apart and take a look. If you don't see it then say goodbye to your special screw unless you have a trap further down stream – Eric F Jan 28 at 20:18
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    @EricF thanks, I ended up taking it apart. It was a lot easier than I thought it would be and the special screw was there! Feel free to add your answer and I’ll mark it as the solution. – dniviE Jan 28 at 20:25
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That style of sink drain that you show has a trap at the bottom. A trap on a sink, regardless of the style you show or the traditional U style, serves two purposes:

  1. Catch things that people drop down the drain
  2. Prevent sewer gasses from coming up

This means that any water device that has a drain in a house must have some trap. IF your sink did not have the one shown in the picture, chances would have been that it is down stream somewhere. In both styles, you simply can unscrew where it attaches with a wrench of appropriate size and the trap comes off.

Note: Keep in mind that after retrieving your item to let water flow through it for a little bit again as this puts a layer of water back in the trap which is what really protects from sewer gasses.

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