Instructions
The tube comes with the barb intact, so just cut the tubing to desired length. Then insert the plastic barb into the drain exit of GOthrough (until it's about half way in) as shown in the photo.
Tip
Best to wear undershorts to protect your skin against irritation from the plastic barb.
How to Clean
After wearing, clean with soap, water and alcohol and rinse with water. Let air dry and reuse.