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You can use a threaded fitting to connect it. If you find a plumbing master, you can solve this problem for you.
I am from Jinyang Pipeline, it is best not to use a plugging agent, because the leakage point has always existed, so it can be replaced with the safest repair.
It is necessary to buy a reducer and a PVC pipe fitting.
1. You can use a reducer to put into the cast iron pipe of the lower building, and after the contact is good, seal it with sealant at the place of contact. >>>More
In this case, like you said, it is unlikely to be blocked, only to change a PPR hot water pipe. I think it would be better that way!
With a pipe clip, the clamp is glued to the brick with glass glue on the clamp pipe. Use transparent glue to fix the clips and pipes on the bricks for a day, and when they are dry, they are fixed and very strong.
The PVC pipe joint is also a place that is easy to seep water, and the re-melt pipe will be short, and it needs to be replaced again if it cannot be satisfied.