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SPI BIO-A Double Light Control Panel for Aerobic Septic Systems - 50B138

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SPI BIO-A Double Light Control Panel for Aerobic Septic Systems - 50B138

Availability: In stock

The SPI 50B138 is a control panel for aerobic septic system. It is similar to our SPI Bio No Time (50B223) except the 50B138 has 2 lights. One light serves as your high water alarm and the other serves as your air pump alarm.




  • Part Number: 50B128
  • Model Number: A-AV-PT
  • Supply Voltage: 120 V
  • Circuit Breakers: 3
  • Timer: Yes
  • Air Switch: Yes
  • Lights/Buzzer: Red/Amber
  • Shipping Weight: 6.0lbs



  • Circuit Breakers for Pump, Compressor & Alarm Circuits
  • 24 Hr Timer w/15 minute intervals
  • Large & Easy to Access Terminal Block
  • Externally Mounted Run/Mute/Test Switch w/UV resistant sealing boot
  • Externally Mounted Audible Alarm
  • Rugged UV resistant Externally Mounted Alarm Light
  • Durable Weather Resistant Hinged Poly Enclosure
  • Labeled Back Panel
  • Ground Lug
  • Easily Replaceable Components
  • Nema 4x Rating
  • Color Coded Internal Wiring
  • Built and Labeled to UL 508A Standard
  • Works with most Aerobic Treatment Systems
  • Provided with Wiring Schematic and Detailed Connection Diagram for Installer
  • Mounting Feet for Enclosure
Additional Information

Additional Information

Manufacturer SPI
Attachment View File 50B138-A-AV__Sales_Sheet1 Size: (175.32 KB)
Product Reviews
Number of reviews : 7
Average rating : 3.6 /5
B. Yaakov
  the 05/04/2022
1/ 5
Never received what I ordered but I was charged for it.
W. Steve & Diane
  the 02/11/2021
5/ 5
Well made and with good documentation.
A. Anonymous
  the 08/09/2018
4/ 5
Box needs to be bigger for all the wires to fit in it
A. Anonymous
  the 04/01/2018
5/ 5
Haven't installed it yet but looks like it well built
A. Anonymous
  the 06/07/2017
5/ 5
good quality, diagram makes the connection a breeeze. Using this box for a ClrStrm 500n replacement.

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