Tank Lock Revolution!If you have struggled with properly clamping your BCD to your cylinder, the Apollo Bio Tank Lock is for you. Apollo has redefined the standards for Scuba diving. The Bio-Tank Lock can secure a diving tank in seconds with little effort and up to ten times more tightening torque than any conventional tank lock on the market today. Apollo employs an advanced adjustable screw system that makes installation and removal a breeze, even with thick gloves. The heavy duty spring automatically adjusts as the webbing expands and contracts. The Apollo Bio-Tank Lock will accommodate any tank size and is adaptable to most BCDs. With it's ease of use and reliability, the Bio-Tank Lock adds confidence, safety, and comfort to every diver.