W.C. Pan and basin waste connection



Hello all.
I have a single external soil-stack vented at the roof level. The toilet is on the ground floor with a washbasin in the same room.
At the moment the washbasin waste pipe goes around the toilet, out through the wall and then connects to the stack outside but it is cracking as I think the wrong internal type of plastic pipe was used.
I am intending to replace the toilet. Could anyone tell me if it is permissible to connect the washbasin waste to a new pan connector with an integral 1+1/4 inch boss such as the Multikwik MKSB4 as this seems to be the same thing as taking the waste pipe outside to the soil-stack ?
Thanks in advance for any advice you can offer,
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