‘M’ Italy and Part number 06165 on the stem. T C on fitting wall.

Made from steel or stainless steel, the part reacts to a magnet.

The wrench size for the fitting is roughly 1 ¼”. The fitting size seems to be for ¾” NPT. Overall length is 5 inches. The tube diameter is roughly ¾”. There is a retaining flange and o-ring seal.

Photograph is provided for quantity in the lot and for detail. I think this is with 3/4″ hose Similar items are used for hydraulic, brake, transmission, and fuel lines.