Male X Press Press Fit Bronze Adapter
https://www.fadavalve.com/product/press-fit-bronze-adapter/vprofile-press-fittings-cc499k-bronze-male-x-press.html
The Press joining is a connection to make permanent and not reversible deform of the fittings on the pipe thus leading to a perfect mechanical joint, while the O-Ring provides for the hydraulic tightening connection. Pressing provides for a constant quality joining, easily reproduced and with a minimum physical effort by the operator.