![Pres Air Trol TinyTrol 3PDT FF Air Switch [Blue] (MCB311A) calvertengineering This replacement is especially useful](https://cdn.shopify.com/s/files/1/1751/9347/files/59-369-1360_XL.jpg?v=1718260564)
Pay in 4 interest-free payments of $10.25 Learn more
Ships within 48 hours · Estimated delivery Sep 9 - Sep 14
This replacement is especially useful when the original transformer has failed
A 10-pack can be practical for maintenance teams or repeated service applications
A check valve is useful because it helps prevent backflow while allowing water to move in the intended direction
Helps preserve original replacement fit
Pres Air Trol TinyTrol 3PDT FF Air Switch [Blue] (MCB311A) calvertengineering This replacement is especially usefulThe PresAir Trol TinyTrol 3PDT FF air switch in blue is designed for compatible pneumatic control systems that need a 3PDT switching format in a compact air actuated design. Air switches like this are useful because they allow electrical functions to be triggered through pneumatic input rather than a direct touch electrical control. This version is especially useful when the original air switch has worn out, sticks internally, or no longer switches