Cap has 3 holes with 1/4-28 threads at the top for use with 1/8 in. O.D. tubing. No need to precut tubing to reach the reservoir bottom, just a quick quarter turn of the lock nut (from outside the reservoir) allows positioning of PTFE tubing at any depth. Thread size: 45 mm.
System 45 is a trademark of John Babashak
Aldrich is a registered trademark of Sigma-Aldrich Co. LLC