comments:
You're looking for a 3 way ball valve Something like this (I have no idea if this company is reputable) https://metalcubeco.com/products/180ss-series-3-way-l-port-forged-brass-ball-valve?variant=40604874178749&country=US¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gad_campaignid=23485729395&gbraid=0AAAABCpR3t3aqPWnkMhBKv_a9Vwy80faK&gclid=EAIaIQobChMI4Ju5vYuVlQMV5SrUAR1pYB5lEAQYASABEgKKy_D_BwE This is sort of a more common part for RVs and pools. But regardless you WILL need adapters, I suspect nothing off the the shelf will just bolt right in with what you currently have. It should be noted that in the 45° position of a standard 3 way will mix the sources which is not ideal (shouldn't be a problem with the backflow preventer you'll be using though) I'm guessing it's not adapters you're concerned about though; more so the "one valve". They have purpose built systems for this too if you can spend a bit more https://www.amazon.com/RecPro-City-Water-Diverter-Valve/dp/B09D1N9FW6 Or for mixes of well/city water you'll see even more sophisticated systems https://rainharvestingsupplies.com/1-alternate-water-supply-3-way-valve-kit-12v-dc/?srsltid=AfmBOorgikTQQls_LT9aqj2giIWtrEOgXAufXryVCIunFBvrcWv1cInr