This T Piece junction will accomodate a 100mm ID PVC pipe.
It is designed to be used in conjunction with my other design of a 90 degree elbow and fit 100mm ID PVC pipe and/or a 100mm flexible hose.
The other design is here:
https://www.printables.com/model/1011868-mimaki-fume-extraction-fitting-90-degree-v3
The author marked this model as their own original creation.