Gast, AT05, Rotary Vane Air Pump with Fan


The Gast AT05 Septic Aerator is the industry work horse. It produces little noise, about as loud as a conversation at home or the office. That’s very different from older-model rotary vane pumps.

The AT05 lasts far longer because, unlike linear pumps, it doesn’t use rubber diaphragms that wear out within 3 years. This rotary vane pump uses nickel-plated rotors and a unique coating inside the pump that reduces wear. Gast added a built-in fan to cool the pump during hot, southern summers. Overall, this septic aerator should last up to 10 years.

One of the best things about the Gast AT05 is that it will overcome system pressure up to 10 PSI. That is four times more back pressure than linear pumps can handle. If diffusers in the tank are clogged, the AT05 can overcome the back pressure until your maintenance provider replaces the diffusers. That means the oxygen continues to flow to aerobic bacteria in the tank, and your system won’t go septic.

Repair kits are easy to install. The AT05 is designed for ease of maintenance. Whether you want to change the air filters or perform a complete re-build, a few hand tools are all you need. You can do a complete re-build with a Gast OEM kit in less than an hour.

To rebuild or repair this pump, use kit K882.

  • Trouble-free for up to 10 years
  • Built-in cooling fans protect the pump from summer heat
  • Advanced, low-wear vane technology
  • Low noise compared to other pumps, and
  • Energy-efficient motor design

To rebuild/repair pump use kit K882.

AT05-520-G215DX is the same as AT05-101-G215DX. It is pre-wired for your convenience to make installation easier. It is a Gast OEM product.

Take Me There

Please note: This product’s voltage is 115VAC only. Cables not included.

22 in stock

Product Specification
Noise 59 dB Between a library and a quiet conversation at home.
Power 1/4 hp 0.19 kW
Minimum Temperature 33.8 Fahrenheit 1 Celsius
Maximum Temperature 104 Fahrenheit 40 Celsius
Minimum Pressure 0 60 Hz
Maximum Pressure 10 PSI 60 Hz
Additional Information
Weight 33 lbs
Dimensions 18 × 11 × 12 in







This item has a 1-year manufacturer's warranty.


Reviews (1)

1 review for Gast, AT05, Rotary Vane Air Pump with Fan

  1. 5 out of 5

    Ted Strader (verified owner)

    Great product, price, and service.

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