Adapters for Berryman B-12 Chemtool Thru-Rail Fuel Injector Cleaner (part #1120) can usually be found at auto parts stores and online suppliers like Grainger and McMaster-Carr.  The thread on our Thru-Rail Fuel Injector Cleaner is the same as 134a, i.e. 7/16-20 right hand thread. You will needs to ask for an adapter for that thread type to your car’s fuel rail.

I cannot find a single adapter with the right threads, r134a uses a 1/2 tapper thread, I literally cannot find any 7/16 tapper adapter, the only thing that I've found is a 7/16 adapter for self sealing r600a cans which won't work here.