Need a cowl to fit on to this piece of pipe

NIMAN

My soil stack is a 4" square pipe, where I thinks it's meant to be 6" round.

I would like to get a small cowl to produce a draft up the soil stack.

Anyone know where I could get a small cowl to fit on to the end of this 6cm round, or one to fit on to a 4in square end?

Payton

Have a look at Screwfix for a 90 deg round section plus a ventilation grille to fit the 90 deg round section

NIMAN

These sort of things?

Doolittle51

The item in the first post looks like a square to round gutter adapter. Nothing to do with a soil stack. Soil pipes are 110mm round pipe.

NIMAN

https://www.boards.ie/discussion/comment/122378087#Comment_122378087

Yeah, but mine isn't. Hence the item in the 1st post.

My soil stack is square. That's why I have that little piece to change the top of it to a round fitting, as I thought I might be able to get a cowl suitable for a round end easier.

standardg60

https://www.boards.ie/discussion/comment/122378463#Comment_122378463

Can you post a pick of this pipe in-situ?

NIMAN

That's the pipe in situ.

standardg60

Ok that's not a soil stack, it appears to be a vent to stop the water being siphoned out of the adjacent gully trap or elsewhere.

To answer your question, it doesn't need a cowl as it's purpose is to draw air in to prevent back siphoning.

I should add that soil stack cowls are to stop birds falling in, I doubt you'd have that issue.

NIMAN

So I don't actually have a soil stack then!

Doolittle51

A soil stack is 110mm round pipe that your toilet waste feeds into. It's usually a straight vertical pipe that goes into the ground and feeds into the sewage system, the top of it extends above the eaves.

Not sure what you've got there, as standardg60 said, it must be some kind of vent for the waste system but it's not a soil stack.

dathi

https://www.screwfix.ie/p/floplast-balloon-leaf-guard-black-65-68mm/68030?tc=AI4&gad_source=1&gclid=Cj0KCQjwkdO0BhDxARIsANkNcrdliKcwpAbRDlvDD8QY8ukSJsS3Lk8835kSPDZ7YLcO4EPc3FO6v2kaArfxEALw_wcB&gclsrc=aw.ds

this?

Mr321

https://www.boards.ie/discussion/comment/122378858#Comment_122378858

Where is that going to when it goes to the gulley in the ground?

As stated already that's a gutter pipe fitting you have in your first post but could still well have been used as some sort of soil svent by some cowboy 🤠

NIMAN

Yeah, that's my understanding.

It is positioned outside a toilet window so I always assumed it was my soil stack, and I found out early on it was the wrong size.

Too late now, as it's in over 20 yrs at this point, and it's surrounded by tarmac so not sure where it goes. There is a manhole cover about 6 feet from it.

Am I correct in thinking you can add a new soil stack to the system if this one isn't doing its job?

standardg60

https://www.boards.ie/discussion/comment/122386062#Comment_122386062

FWIW I have no soil vents on my waste system, for the reasoning that like yours it's all on the ground floor so there are no vertical falls that would create a vacuum.

If you're not having any issues then your current setup is fine, and is a lot neater than a 110mm soil vent pipe.

NIMAN

https://www.boards.ie/discussion/comment/122386328#Comment_122386328

I have 2 ensuites upstairs too though.