Best Seller
  • Gast AT05 Rotary Vane Septic Air Pump - Part Number AT05
  • Gast AT05 Rotary Vane Septic Air Pump - Part Number AT05
  • Gast AT05 Rotary Vane Septic Air Pump - Part Number AT05

Gast AT05 Rotary Vane Septic Air Pump


The Gast AT Series Rotary Vane air pumps replace the Gast 23 and Gast RV Series. The Gast AT05 Rotary Vane Compressor fits many 500 GPD or larger aerobic septic systems. The new and improved model is quieter and more energy efficient than previous older models. The cooling fan on motor promotes longer life and is recommended for use on septic systems.

The Gast AT05 Rotary Vane aerator is a compatible replacement for the Gast 0323, Gast 0523, Gast RV03, Gast RV05, Thomas QR-0030, and Thomas QR-0050.

In Stock

$632.75MSRP: $699.00

Item #:AT05

Manufacturer: Gast

Power Cord Options:

Gast AT05 Rotary Vane Specifications

  • Gast Model AT05-101-G215DX
  • 4.8 cfm (cubic feet per minute) Maximum Air Flow (@ 0 PSI)
  • 5.0 psi Maximum Continuous Operating Pressure
  • 1/4'' Female Threaded Outlet
  • 1/4 HP, 120VAC, 60 Hz, 4.7A
  • 1 Phase, 1725 RPM, 1.00SF
  • Totally Enclosed External Motor Cooling Fan (Not Included on 0523 Model)
  • Dimensions: 13.74'' L x 8.32'' W x 6.30'' H
  • Includes All Internal and External Air Filters and Mounting Feet
  • Condition: NEW
  • Replaces the Gast models 0323, 0523, RV03, RV05, Thomas QR-0030, and Thomas QR-0050
  • Fits Many 500, 600, and 750 GPD Aerobic Treatment Systems (Sizing is Determined By Brand of Aerobic System)
  • Replacement Parts Available
  • One Year Manufacturer's Warranty

Gast AT05 Rotary Vane Applications

The Gast AT05 Rotary Vane septic air compressor is used on 500-750 GPD rated NSF Class 1 Standard 40 aerobic treatment systems (ATUs).

The Gast AT05 unit includes an external motor cooling fan which promotes longer motor life when compared to the Gast 0523 model which does not include this external fan. The Gast AT05 is recommend in continuous duty applications and also applications where the motor will be running in a very warm ambient environment.

Gast AT05 Rotary Vane Frequently Asked Questions

Below are some frequently asked questions about the Gast Rotary Vane Septic Air Pump. If you have further questions, call our customer support staff toll free at 1-877-925-5132 or email!

Does the Gast AT05 Rotary Vane aerator need to be protected from the weather?

The Gast Rotary Vane compressors are not weatherproof and must be protected from the elements of Mother Nautre. Click here to view the air pump housing options.

Which size Gast Rotary Vane septic aerator pump do I need?

See our air pump crossover guide below. All of the equivalent models are shown down the columns, with each row representing the brand.

Does the Gast AT05 come with a manufacturer's warranty?

Yes. The Gast AT05 comes with a standard manufacturer's warranty of 1 year. Every Gast AT05 purchased from Septic Solutions is comes with a Manufacturer's Warranty that lasts 12 months from the date of purchase.

Can the Gast Rotary Vane compressors be used for pond aeration?

Yes the rotary vane pumps work well for pond aeration applications. The AT05 can work in ponds as deep as 10 feet. The 0523 can work in ponds as deep as 15-18 feet.

Linear vs Rotary Vane...Which Should I Choose?

Linear diaphragm pumps are more energy efficient and much quieter than their rotary vane counterparts.

Rotary Vane pumps use significantly more power and create a lot more noise, but in some applications that require above 3 psi they will last much longer.

In most cases, linear and rotary vane units can be interchangeable. It is up to the end user to determine what is most important from the pros and cons listed above as to which is the best choice for their application.

How To Wire a Gast AT05 Rotary Vane Compressor

Gast AT05 Rotary Vane Aerator Downloadable Documents