The PresAir Trol air button switch in DPDT alternate format is designed for compatible pneumatic control systems that use a threaded installation and center spout configuration. Alternate-action air switches are useful because they change and hold state with each activation, making them a strong fit for control functions that do not need a constant finger press.This version is especially helpful when the original switch has become inconsistent, no longer alternates properly, or fails to maintain the intended state after actuation. The threaded design also supports installations where a more secure mechanical mounting style is preferred.It is a practical replacement when you need to restore maintained-state double-pole pneumatic switching in a configuration-specific application. PresAir Trol DPDT alternate air button switch Threaded design with center spout configuration Helps restore maintained-state pneumatic switching Useful when the original switch no longer alternates correctly Supports more dependable control behavior in compatible systems