Cartridge Spacer for Peptide Pens (5-Pack)

Use every last bit of a cartridge. Many reusable pens have a cartridge holder that runs a little longer than a standard 3 mL cartridge, and most glass cartridges, ours included, come with a short 8.2 mm rubber stopper. The pen's piston stops just short of the stopper, and the end of the cartridge is left behind as dead space. This spacer sits between the pen's piston and the cartridge's rubber stopper and fills that gap, so the piston reaches the stopper and the pen can use the last of the cartridge.

How to use it

1. Prepare your cartridge as usual.
2. Drop a spacer onto the grey rubber stopper at the open end of the cartridge.
3. Load the cartridge into the holder the usual way, with the spacer end facing the pen.
4. Attach the holder to the pen. The piston now meets the spacer and moves the stopper all the way up.

Why the fluted shape

A plain cylinder acts like a cork. It traps air, fights you on the way in, and holds on by suction on the way out. The six-fin body leaves open air channels along its full length, so it drops in and comes out without forcing. Both ends are chamfered so they won't catch on the glass rim, and it's symmetric, so there's no wrong way up.

Details

• Fits 3 mL glass pen cartridges: 9.4 mm across the fins, 8.5 mm tall
• Sits between the pen's piston and the cartridge's rubber stopper, on the dry side, and never touches the cartridge contents
• Designed and 3D printed in the U.S. by ShotLog
• Reusable
• Pack of 5

Before first use

Check that the spacer slides freely in your cartridge, then prime the pen as usual. Fits every pen ShotLog sells: the Reusable Peptide Pen V2 in Original Style and New Style, the 510(k) Reusable 80 Unit Pen, and the Auto Pen for 3 mL Cartridges.