~ SM01.125 Vacuum Breaker Adapter~ Turns an Arrowhead Anti-Siphon Hose Bib Into a Straight Through Connection. Fits Bottom of PK1390 Stamped 1019-A-BFP Valve(1, SPGTM-2)

I had this issue with the bib for my pool. Drove me crazy, and I finally found this one: https://a.co/d/01ZagZLQ Now I attach a regular vacuum breaker to that one or a hose.

https://a.co/d/01ZagZLQ