I have them for 8mm and 10mm @Madrab , surplus from my BG days , but use the splitter on anything 15mm and above , but yes you are correct , not a Diy tool for all the times they are ever used
The brass puller tube is fine if they have not been overtightened.
But water pump pliars would usually twist them off anyway.
If like many they have been overtightened then I am at them with the junior hacksaw, most of way through then a flat screwdriver in the slot to snap it.
You can buy an olive cutter which does 15 22 and 28 plus any other size .
I prefer this to pullers hacksaws grinders and all the other methods
Bought them a few years ago from an independent plumbers merchants and are totally brilliant
They look like a pair of small bolt cutters with one side which is flat and the other for cutting the olive thus you can use them on any size pipe without damaging anything
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