This open inflatable plug features a metal bypass tube through the center of the plug to pressurize plumbing lines by inducing air or water. The rigid bypass tube allows for a high volume of air or water to pass through the plug, while still maintaining the versatility of an inflatable plug. They are not as durable as mechanical plugs, but provide a versatile solution for out-of-round plumbing or hard-to-reach locations.

Each version comes with a 6" air hose for inflating the plug. The standard 550BP version includes an L-shaped quick connect off the top of the plug for use in pump baskets and other tight areas. The 550BP-CPH version replaces the L-shaped quick connect with an 18" induction hose so that the plug can be lodged farther into plumbing past valves or threads.