It came with the nitrous kit itself, when I hooked everything together I still had it left over.
My kit was used but when I received it that upper fitting was connected to the aluminum inline adapter that was connected to the Zex management box on the nitrous side. It lead to the purge solenoid.
The other fitting I have no clue. Looks like you could do a dual purge set-up with hoses instead but the barbs look kinda big for that. It may be my slanted eyes playing tricks on me though...lol