Connecting into a 3 inch soil pipe? Is there a fitting?

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Does anyone know where I can get fitting to connect into an existing 3 inch soil pipe?

I have seen the flange type ones for 4 inch where you drill the hole and then bolt it around. Where can I get a 3 inch version?

I think its a strap boss?

Thanks,
 
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Just a thought here, but my house has a normal 4" stack, but above the highest connection it is reduced into a 3" for the vent pipe out of the roof.

The OP did say "Loft", so I reckon they might be trying to connect into the very top of the soil stack, currently used as a vent.
 
Just a thought here, but my house has a normal 4" stack, but above the highest connection it is reduced into a 3" for the vent pipe out of the roof.

The OP did say "Loft", so I reckon they might be trying to connect into the very top of the soil stack, currently used as a vent.

Thats exactly what mine is like. All 4 inch then with a 3 inch vent above the last toilet going up to the roof.

Was hoping that I could connect into this 3 inch pipe higher up, rather than running a sink/bath drain all the way down the void to the 4 inch section.

Any problems with that?

Any ideas where to get a 3 inch strap boss?

Thanks,
 
Local drain center stock 3" strap on boss. I fit them quite often. Got one to do tomorrow.
 

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