Not much to say here, the picture pretty much shows what I did. The barrel I used is 30" in length, with a 26" air chamber. Note it is important to let the PVC cement fully cure. A number of people have told me stories about how they eagerly tried their aircannons too soon, blowing out the air chambers. Pesco's first air cannon did not have the barrel glued into its connector, and consequently self destructed while firing for the 4th or 5th time!