This fitting is a 3/4" x 3/4" PEX-AL-PEX compression coupling fitting manufactured from brass and designed for heating applications.
This 3/4 compression coupling connects two ends of 3/4 PEX-AL-PEX tubing together.
What is this piping? It's not pex and the quick press fittings don't work on it. : r/Plumbing
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