I don't know but would check how much play there is in the tube up to that point because if there is enough, then you could get a plastic 3-way tee and put short segments of standard rubber hose on all 3 nipples to connect it all back together with hose clamps or stainless wire ties (ebay, if you want to wait weeks for a cheaper delivered price, or an AU seller to sacrifice price for faster delivery).
There probably is some application that uses such a rubber 3 way tee with that diameter, but if you can't get an OEM part # or know of which other applications it is used in (could be anything from industrial to farm tractors) then finding it could be daunting.