I see the Clack C1190 and Fleck 125, but I believe both of them have more proprietary connections. Can't find much info of that though, so please correct me if I'm wrong. I found these two that should work:
Really not much info available about these different options, so I was wondering if anyone had recommendations here.

In & Out Valve 990S with 1
Designed for simple in-out filters such as pH neutralizers, taste and odor, etc. Fits 2½" NPSM tank opening. The 990S and the 900M has 1" FIPT openings with 1.050" distributor opening.
titanwaterpro.com

In & Out Valve for Whole House Water Filter System 2.5
Description: Offer is for (1) IN & OUT Valve 1" FPT Fits FRP Tank with 2.5" Standard Opening. In & Out Whole House Water Filtration Valve Fits regular FRP/Mineral Tanks of 2 1/2" Tank Thread
titanwaterpro.com
Really not much info available about these different options, so I was wondering if anyone had recommendations here.