# How to Fill a 3mL Peptide Cartridge | RefillPen

URL: https://www.refillpen.com/how-to-fill-peptide-pen-cartridges

Last updated: 2026-10-19T05:24:35.298Z

> How to fill a 3mL peptide cartridge in 9 steps: swab the cart, attach the luer lock, use the yellow Filling Button, slow-fill, and watch the grey stopper.

## Tips for Filling Your 3 mL Cartridges