FYI, I use BD Nano 2nd Gen needles (they have a relatively flat area adjacent the metal needle, almost the diameter of the pen screw on connector, vice a small diameter plastic piece like many needles have), they’re the 4mm length. I got these when on MDI (using 5-9 every day); now that I fill my pod every 3 days, it just may be lifetime supply! I’ve never had a problem with them working with pods; the longer 6-8mm type some folks use may be too long for the body/insulin chamber of the pods.