Waste pipe diameter

[imamartian]

I'm not bragging, but mine is 36.3mm in diameter

I know the standard sizes are 32mm (1.25") and 40mm (1.5"), but my existing pipe equates to one and seven sixteenths of an inch !!
Is this an old size? or a foreign import?

I'm replacing the basin and want to re-route the waste. What are my options? I haven't cut into it yet, but my hope is that a 32mm pipe will fit inside it. If it doesn't then i don't think a 40mm compression fitting will be secure enough. I have see these:
http://www.screwfix.com/app/sfd/cat/pro.jsp?cId=101708&ts=77934&id=29220
is this my best option?

Any help would be appreciated.

 

[Bahco]

You can change the lot, fittings and all for less than £10 and you will know there are no blockages.

 

[imamartian]

sorry i didn't explain myself fully.... i am replacing it all but it's the fitting into the soil stack. Do i need a strap on boss (not sure that's gonna get by the moderators ) ?

i was going to leave about 6inch of the pipe into the stack and feed the 32mm into that.

 

[Bahco]

i was going to leave about 6inch of the pipe into the stack and feed the 32mm into that.

It will look shabby.

Do it properly.

 

[imamartian]

don't mind too much about how it looks, i'm boxing it in.

Am i understanding the sizes correctly? could i get a 'boss' to reduce 36mm to 32mm?

or is 36mm the 'old' equivalent of 32mm - i've just noticed some print on the elbow - it's a Marley fitting and has 1.25" on it and also the number 34 which guess mean 34mm?

thanks

 

[Bahco]

I don't know if they do a boss insert of 36 mm, they are normally 32 or 40mm.

Still not sure why you are going down this route.

Fit a new strap on boss to your stack and feed your 32 mm into it job done.

How is the existing waste fixed to your stack?

 

[imamartian]

I'm perhaps misleading you...

I currently have a corner sink, a trap, two 90deg elbows and 2' of pipe into a boss pipe in the stack. The 2' of pipe has an external diameter of 36.3mm.

I am replacing the sink, and re-routing the pipe, but entering the stack via the same boss. All the fiitings i've bought are 32mm and will run from my new basin, but at some point i have to merge with the exising pipe or the boss....

Sorry if i haven't been clear

 

[Bahco]

Go to a pumbers merchant and they should have a compression fitting that will do the job.

 

[imamartian]

I've just cut the pipe and it justs fits in a 32mm compression... so i'm sorted....

Thanks for your help Bahco..