I used the propane tank for a small camping grill. Cooked with it until the tank was empty. Then it has a valve on top of tank near the edge that is a valve to release pressure. You pull on it to release any residual propane or fumes. I pulled back on it and got very little out but did smell propane. I then crossed my fingers, and drilled this puppy. I have done one more this way with no problems. Still have all my fingers and eyes.