Lifegard Aquatics' Airline Bulkhead Kit is designed to hide unsightly airline tubing, rather than drape it over the top and into a tank. Customers can pre-order or simply drill a 11/2-in. diameter hole in the bottom or side of the aquarium tank, the company states. The kit includes the airline bulkhead with gasket and lock nut, 6-ft. of airline tubing, two check valves, elbow fitting and complete instructions. When attached to an air pump, it can be used to drive any air stone or aquarium toy device, the company adds.