Dodgy under sink pipework

[alex79]

Hi,

After having a new washing machine installed, I noticed that the under sink pipework looks as if it's connected incorrectly. I've run a test cycle and the machine seemed to drain without a problem but I wouldn't know how to discern if the drainage pump was being taxed.

Previously I used the sink for a month without thinking about the pipework, since it was connected to a non-working washing machine and I didn't notice any leaks. The sink seems to drain without any problem. Also there are no smells from outside for the moment.

In google images I saw that it's usual for the to-drain pipe to connect to the u-bend and for the washing machine pipe to connect to the t-junction. However as shown my pipework is reversed.

I'd like to know if it's okay to keep the pipework as it is or if it could possibly damage the washing machine or cause water from the sink to interfere with the washing cycle.

 

[HERTS P&D]

Your trap is wrong, you need one of these:

https://www.screwfix.com/p/floplast-sink-washing-machine-trap-white-40mm/12794

Andy

 

[Dan Robinson]

Its the same trap - just plumbed in backwards

 

[HERTS P&D]

Well done Dan, you were the first one to spot the deliberate mistake.

Andy

 

[Nige F]

Hi,


I'd like to know if it's okay to keep the pipework as it is or if it could possibly damage the washing machine or cause water from the sink to interfere with the washing cycle.

It needs changing - the w/m pipe will fill with water because it's lower than the outlet as it is now - also the w/m pipe should rise up near the underside of the worktop - then fall to waste.

 

[fixitflav]

Hi,

After having a new washing machine installed, I noticed that the under sink pipework looks as if it's connected incorrectly. I've run a test cycle and the machine seemed to drain without a problem but I wouldn't know how to discern if the drainage pump was being taxed.

Previously I used the sink for a month without thinking about the pipework, since it was connected to a non-working washing machine and I didn't notice any leaks. The sink seems to drain without any problem. Also there are no smells from outside for the moment.

In google images I saw that it's usual for the to-drain pipe to connect to the u-bend and for the washing machine pipe to connect to the t-junction. However as shown my pipework is reversed.

I'd like to know if it's okay to keep the pipework as it is or if it could possibly damage the washing machine or cause water from the sink to interfere with the washing cycle.

From your pic I can't tell where the dark-coloured drain pipe connects. And what's the pipe coming out of the wall? If you hadn't identified the drain pipe I'd have assumed it went to drain. If so, there is no trap between sink outlet and drain, so there's a smell risk, even if you've had none so far.

 

[alex79]

Your trap is wrong, you need one of these:

https://www.screwfix.com/p/floplast-sink-washing-machine-trap-white-40mm/12794

Andy

Thanks. I wasn't sure if it was a trap or just a t-junction. Now I know what it is I can go ahead and try to reverse it.

From your pic I can't tell where the dark-coloured drain pipe connects. And what's the pipe coming out of the wall? If you hadn't identified the drain pipe I'd have assumed it went to drain. If so, there is no trap between sink outlet and drain, so there's a smell risk, even if you've had none so far.

Optical illusion, sorry - they're the same pipe, so the drain pipe is connected to the machine inlet which is reverse as Andy has confirmed.

Thanks all for the replies.