That is the way I read it. 7/8-14 UNF. That is what I put in my Luxfer SCBA tank.
I’m a bit weird. I went with a DIN 300 valve as I use a SCUBA compressor to fill my tanks and my fill adapters work with either the DIN200 or the DIN 300 connections. I’ve got many dive tanks with the DIN 200 and I can live with lower fill pressures in most of my PCPs. The standard for SCBA tanks is CGA346 and CGA347 IIRC.