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The SPI 50B135 is an external alarm box for septic air pumps such as the Hiblow HP 80. Many of our customers desire an alarm that notifies them when their septic air pump needs servicing. This can be done 1 of 2 ways. You can buy an air pump with an attached alarm or utilize an external alarm like this one. This unit has a pressure sensor that you can hook up to your air pump that will turn on the alarm if you air pump drops below 1psi.
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