Believe this fitting is designed for quick connect ½ inch tubing. Very similar to what I used when I redid entire boat with PEX tubing. Try these guys
https://www.freshwatersystems.com <javascript:void(0)> I used the Watts Aqualock products John Read Legacy III 1982 C&C 34 Noank, CT From: Tom Buscaglia via CnC-List [mailto:cnc-list@cnc-list.com] Sent: Monday, May 23, 2022 8:56 PM To: Stus-List Cc: Tom Buscaglia Subject: Stus-List Plumbing Alera has that old grey hoses for fresh water. I am installing a Raritan Fresh Head toilet that will require a connection to my pressurized water. Not sure when will and will not work with this old hose.. I picked this up. Not sure if it will mate up. 15mm Metric Series Quick Connect Plumbing System Unions, Union - Tee https://www.fisheriessupply.com/seatech-inc-15mm-metric-series-quick-connect-plumbing-system-adapters/2413-0815 Tom B Typoed from my iPhone Tom Buscaglia Alera 1990 C&C 37+/40 Vashon Island WA O 206.463.9200 C 305.409.3660 Skype - thombusc