Yep Butyl.
Sharkbite makes a transition ,or they make pex-B crimp style connectors.
Depending on what you are doing they also still make Quest connectors like you have.
The pex couplings have a little different set of ridges,but the ring is the same.
https://www.ebay.com/itm/132260329654?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D264183%26meid%3Da2450e24637842f0a8ce
Last edited by rong; 04/16/24.
