Adding trap to washing machine waste

tombrown

This is a dumb question, but here goes :-

We often experience sewer-like smells in the room where our washing machine is. This used to be a shower room and the waste pipe from the washing machine was (I believe) connected in to the waste from the old shower.

Now I suspect that either the trap was mistakenly removed when this happened or that it is not sufficiently deep to that the residual water gets flushed out too easily when the machine completes its drainage cycle. More likely the latter, IMO< as the smell is intermittent.

So I want to put a (additional) trap in the waste pipe.

Now my simple problem - the waste pipe is a simple vertical pipe about 2 foot long. My idea is to cut it low down, put in a simple U bend trap and reconnect the cut off part above the trap. My problem is that the the U bend traps I can purchase all seem to have threaded connections so I cant connect directly to the existing pipe which has no thread. So I need something that has a push connection on one end and a threaded connection on the other - in fact I need two, one with a female thread & the other with a male. But looking online or in regular hardware stores I cant seem to find something like this. Do they exist - is there a special (plumbers secret) name for them that I can ask for?

thanks

Robbie.G

tombrown wrote: »

This is a dumb question, but here goes :-

We often experience sewer-like smells in the room where our washing machine is. This used to be a shower room and the waste pipe from the washing machine was (I believe) connected in to the waste from the old shower.

Now I suspect that either the trap was mistakenly removed when this happened or that it is not sufficiently deep to that the residual water gets flushed out too easily when the machine completes its drainage cycle. More likely the latter, IMO< as the smell is intermittent.

So I want to put a (additional) trap in the waste pipe.

Now my simple problem - the waste pipe is a simple vertical pipe about 2 foot long. My idea is to cut it low down, put in a simple U bend trap and reconnect the cut off part above the trap. My problem is that the the U bend traps I can purchase all seem to have threaded connections so I cant connect directly to the existing pipe which has no thread. So I need something that has a push connection on one end and a threaded connection on the other - in fact I need two, one with a female thread & the other with a male. But looking online or in regular hardware stores I cant seem to find something like this. Do they exist - is there a special (plumbers secret) name for them that I can ask for?

thanks

You can get a washing machine trap and standpipe designed for that purpose.
Or if you already have the trap your looking for a 1.5 inch tank connector the threaded part if it will go on the top of the trap and it has a push fit connection on the other side.
You will need to either bring a small of cut of pipe with you or need to know the make and type of pipe there are a few different types of waste pipe

tombrown

Thanks

Is there a minimum recommended length of standpipe above the trap?

Robbie.G

tombrown wrote: »

Thanks

Is there a minimum recommended length of standpipe above the trap?

You would need to be at least 300mm

tombrown

Guys - thanks all for the advice; I have now fixed the issue & the smell has not returned

galwaytt

Fwiw I've used these for 15+ years and found them great and a very easy DIY fit. Also needs no additional space to fit.

http://www.hepvo.com

CJhaughey

galwaytt wrote: »

Fwiw I've used these for 15+ years and found them great and a very easy DIY fit. Also needs no additional space to fit.

http://www.hepvo.com

Good advice, I have these for nearly 10 years and never had any problems with them.