Well Pump Diaphragm Pressure Switch DiagramDiaphragm Pressure Switches are often paired with sump pumps to monitor water levels and play a pivotal role in keeping buildings dry. Diaphragm Pressure Switch Used in Sump PumpTo avoid flooding, it’s crucial that a sump pump turns on at the correct time in order to flush water out. This action must be triggered by a switch. Presair fills this need using our compact, Tinytrol pressure switches.


Presair pressure switches can be used to monitor rising water levels and prompt a sump pump to action. These switches sense pressure against the diaphragm to accurately read how much water is present in a system. As the water level rises in a sump basin, the air pressure pushing against the diaphragm builds within the switch. Therefore, the switch is preset to actuate at a specific water level. When the specified water level is reached, it will generate a precise pressure in the basin. The diaphragm is calibrated to complete a circuit at that exact moment and initiate the pump.

Presair pressure switches are small and accurate. This makes them the perfect fit for a congested sump basin. Other switching options can be cumbersome and difficult to maneuver. But Presair’s durable, precise, pressure switches help keep basements dry and people happy.

Presair pressure switches make electrical contact when a certain set pressure has been reached on its input. These switches are available either field adjustable or factory set allowing each micro switch to operate at a different setting.

Each switch is designed & manufactured to exacting standards to meet the needs of original equipment manufacturers & instrument makers for low cost, stable switches & good repeat accuracy.

Our pressure switches have a range of 0.25 inches of water to 125 PSI.

Presair offers:

  • Pressure Monitoring System
  • Tinytrol Miniature, Factory Set Pressure Switches
  • Adjustable Pressure Switches
  • Sensitive Differential Pressure Switches
  • Printed Circuit Board Mount Pressure Switches


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Pneumatic Switches

Presair pneumatic switches are great for safe, economical control of consumer, industrial, medical or other products and appliances in wet, chemical or explosive atmospheres, or just for added safety.

High Quality

Presair switches are 100% testing before leaving our facilities.

Made in U.S.A.

Products are designed & manufactured in Eau Claire, Wisconsin, USA.

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