4 inch double swept tee

[plumber89]

Just wondering if a 4 inch double swept tee is possible to buy, as i remembber at college i was told you werent alowed anything like this as you could get flow going wrong way. in my situation i have one wc with a about 600mm length to stack and another one with a 5 metre run to soil stack, i was wondering if the one with longer run was flushed could water be pushed up the other run?
cheers

 

[Puddle]

You can get them as below

http://www.plumbstores.co.uk/fittings/soil-waste-fittings/110mm-soil-double-branch-87-5-4-sock-s-grey.html


I was always told bad practice for reasons as you say and staggered branches should be used however we are using less water for flushes now so maybe if calcs worked out,not such a big thing

imho

 

[thereisawizza]

Just wondering if a 4 inch double swept tee is possible to buy, as i remembber at college i was told you werent alowed anything like this as you could get flow going wrong way. in my situation i have one wc with a about 600mm length to stack and another one with a 5 metre run to soil stack, i was wondering if the one with longer run was flushed could water be pushed up the other run?
cheers

I think I may have been asleep or nipped out for a KFC that day at college

 

[Howsie]

Just wondering if a 4 inch double swept tee is possible to buy, as i remembber at college i was told you werent alowed anything like this as you could get flow going wrong way. in my situation i have one wc with a about 600mm length to stack and another one with a 5 metre run to soil stack, i was wondering if the one with longer run was flushed could water be pushed up the other run?
cheers

It depends on the set up. You'll be fine as long as it's not straight runs into the back of each toilet.

 

[WHPES]

Reminds me of a job last year. Some people just bought a house and found that when you flushed the loo, much of it came up into the shower tray. Nice.