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I haven't dismantled that Splitter yet, but it should be straight forward and not difficult, it's not even in the schematics catalog for the hose adapters.
Order Number for the AC906 HP Splitter Service Kit is AK906, every XS Scuba Dealer should be able to order it for you.....
I pulled mine (a non-XS version but looks identical) apart for a special project (reversed orientation of the "y" block and bored the input side for a spool so it could be hose mounted).
IIRC - spin it apart with a couple wrenches (force - yes, brute - meh). There are a couple of o-rings that seal the air barrel that runs through the outer block and (memory failing but) I believe one that seals the air barrel to the end fitting.
Honestly so simple that it was not that remarkable to me.