Desiccant cartridge for QHYCCD. The cartridge is installed on the camera body using double sided tape and is connected to the internal chamber using small silicone tubing and small M5 barb connectors (90° on my model but straight ones will work too). You'll need one R-11 o-ring. The M5 female thread on the cartridge is very small so make sure your printer is properly calibrated otherwise it might be too big and the M5 barb will be loose. I've cutted a small puck of foam (about 5mm thick and 14mm in diameter) to act as a filter at the bottom of the chamber to prevent the barb to become obstructed by the silica gel.