You should be able to get a T-piece kind of adapter to connect it.
Use Loctite 567 or similar product and that will prevent leaks.
If you're too tight to buy it or can't get hold of any, use the standard thread tape.
I have cut a radiator hose and fitted an adapter as my brother wanted it that way in his car (a DIY kit).
I prefer not to do this as it then adds two more possible weaknesses.



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