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Underneath my kitchen sink you can see the following:

plumbing

As you can see, the spout (is this the correct term?) has kitchen roll stuck in it.

Isn't this suppose to be sealed with a cap? Doesn't it run the risk of leaking (granted it hasn't just yet). If it does need a cap what should I be getting for it?

Thanks.

EDIT

Further pictures for clarity.

enter image description here enter image description here

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    It looks like there was once (perhaps) a dishwasher installed, improperly... and possibly still improperly. It has a chance to leak if the pipe backs up, before it backs up into the sink basin it will go onto the floor. It looks like there is a connection on the back as well.... is that a dishwasher? cant tell what is also up top, larger hose, a washer? More photos will help, and a description of everything draining here too. – noybman Jul 14 '19 at 16:50
  • Hi @noybman. I pulled the dishwasher out last week as we weren't using it and it wasn't in the best condition. It actually attached to a similar nozzle that was on the pipe on the left. The only thing that drains into the pipes now are the washing machine and the sink. I'll take a couple more photos and edit my question. – Katana24 Jul 14 '19 at 17:03
  • what is the point of posting more photos? ... clearly, if you get a clog in the trap below, or further downstream, the sink or dishwasher will drain onto the floor .... take the picture to a hardware store and show it to the sales staff and ask for a cap – jsotola Jul 14 '19 at 17:04
  • @jsotola the point is to verify if it requires a cap and, if it does, what to get. Forgive me if my plumbing experience isn't as developed as yours. – Katana24 Jul 14 '19 at 17:11
  • i do not have much plumbing experience, however i know how water behaves ... i am certain that you also know how water behaves ... so the answer to the question whether you need a cap is obvious ... that is why i said to take the picture to a hardware store for assistance – jsotola Jul 14 '19 at 23:27
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That is one option. A better option may be to replace the double-wye with a single wye and eliminate unnecessary potential future leak sources. The wye on the left is no longer needed. The fewer the joints, the fewer potential failure points.

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