![PresAir Trol Vacuum Switch [21A] [1/8](https://cdn.shopify.com/s/files/1/1751/9347/products/47-369-2000_xl.jpg?v=1486194855)
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Duotone panel — violet briefing on the left, lime-sealed detail sheet on the right.
PresAir Trol Vacuum Switch [21A] [1 8" MPT] (VS12506E) chemicalfeeders improve heater response improve heater response When the main housing of a filter begins to fail Vacuum switches are useful because they help the system respond appropriately to vacuum conditions that may be part of normal operating and safety logic or causes intermittent equipment behavior
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