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![PresAir Trol Threaded Stem Pressure Switch [21A] [1/8](https://cdn.shopify.com/s/files/1/1751/9347/products/47-369-1000_xl.jpg?v=1486194839)
PresAir Trol Threaded Stem Pressure Switch [21A] [1 8" MPT] [SPDT] (PM11120A) calvertengineering A control pack is useful A control pack is useful because it gives the spa a centralized operating platform for supported equipment Matching the correct platform and cable type helps preserve dependable signal communication and cleaner installation flexibility The PresAir Trol threaded stem pressure switch is designed for compatible systems that use a 1 8 inch MPT connection and require an SPDT pressure activated switch rated at 21 amps Pressure switches like this play an important role in helping the system respond properly to operating conditions before connected equipment is allowed to run as intended
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