Earn Rewards on Every Order – Unlock Your Discounts Now!

00
HRS
00
MIN
00
SEC

Order before 3PM for Next Working Day Delivery

On In-stock Spare Parts

Over 17,000+ Happy Customers

Charles Austen ET120AO Air Blower 120 l/pm

£129.00

(exc VAT)

£129.00

(exc VAT)

Quantity
VERY POPULAR! ONLY 16 LEFT IN STOCK
OUT OF STOCK
Restocking soon! PREORDER NOW
HURRY! BUY NOW

VERY POPULAR! ONLY 16 LEFT IN STOCK

Secure Payment - Multiple Payment Gateways

The Charles Austen ET120AO Linear Diaphragm Air Pump is a reliable, energy-efficient aeration pump designed for sewage treatment plants, septic tank systems, ponds, spas, and aquatic applications. Delivering a clean, oil-free air supply, the ET120AO is engineered for long-term performance and is ideally suited for outdoor installation thanks to its durable weatherproof construction.

What sets the ET120AO apart is its integrated loss of pressure alarm and additional output cable for connection to an external beacon, providing enhanced monitoring and system protection. If air pressure drops unexpectedly, the alarm system helps identify potential issues quickly, reducing the risk of costly downtime and environmental problems.

Built with Charles Austen's advanced Green Drive Technology, the ET120AO combines powerful performance with low energy consumption, helping to keep operating costs to a minimum while maintaining consistent airflow.


Key Features

  • Clean, oil-free air supply for dependable aeration
  • Built-in loss of pressure alarm for enhanced system protection
  • Additional output cable for connection to an external warning beacon
  • Green Drive Technology for reduced energy consumption
  • Energy-efficient motor with low running costs
  • Specially formulated diaphragm material for extended lifespan
  • Consistent airflow with no performance reduction over time
  • Robust, compact, and weatherproof construction
  • Suitable for indoor and outdoor installation
  • Easy servicing with competitively priced replacement service kits
  • Designed for intermittent or continuous duty applications
  • Whisper-quiet operation with noise levels as low as 35dB


Ideal Applications

  • Sewage treatment plant aeration
  • Septic tank systems
  • Wastewater treatment facilities
  • Aquatic oxygenation
  • Koi ponds and ornamental ponds
  • Aquaculture systems
  • Spas and whirlpools
  • Water features and fountains


Benefits of the ET120AO

The ET120AO provides reliable aeration and advanced fault monitoring in one compact unit. Its built-in alarm and external beacon connection offer additional peace of mind, ensuring you are alerted quickly if system pressure drops. Combined with low power consumption and ultra-quiet operation, it is a cost-effective solution for both domestic and commercial aeration systems.


Specifications:

  • Flow (l/min): 120
  • Pressure (bar): 0.10
  • Noise level (DB): 45.0
  • Power Consumption: 125W
  • Weight (KG): 9.5
  • Dimensions (mm): 315 x 215 x 228
  • Outlet Size: 18mm

 

 

Why Choose the Charles Austen ET120AO?

Trusted by wastewater treatment professionals and pond owners throughout the UK, the ET120AO delivers dependable, oil-free airflow alongside enhanced alarm functionality. Its durable weatherproof design, low maintenance requirements, and energy-efficient operation make it an excellent choice for critical aeration applications.


Warranty information

Charles Austen recommends that all air pumps and systems are serviced annually. Although the air pump carries a 2-year manufacturer's warranty, diaphragms, valves and filters are consumable parts that naturally wear over time and should be replaced during routine servicing to maintain warranty compliance and ensure reliable operation.

Product images are for illustration purposes only and may vary from the actual product supplied.

 

 Data Sheet

 

SKU: BLOBLOWCHA013

Agricultural Tanks Agricultural Tanks Agricultural Tanks

Why Buy Spare Parts from Direct Drainage?

Next-Day Spare Parts

Order in-stock spare parts before 3pm for next-day delivery.

Best Price Guarantee 

Found our product cheaper somewhere else? We will match it!

Authorised Supplier

Over 20 years experience as an official authorised retailer.

Trusted Support

Not sure which part you need? Call our team on 01388 537050.

Agricultural Tanks

YOU MAY ALSO LIKE

CUSTOMER REVIEWS

Rated 4.8/5 by Direct Drainage Customers

Based on over 600 verified reviews

VERIFIED REVIEW

Very helpful from the start to the finish

Items were despatched quickly and arrived the next day. Would recommend.

Title

North Hayne Farm Cottages | 26 June 2026

VERIFIED REVIEW

Cheapest price I could find for the pump

Cheapest price I could find for the pump and delivery the next day what more could you want.

Title

Sam Jukes | 5 November 2025

VERIFIED REVIEW

Great service!

I ordered a septic tank it was delivered within a week and the delivery driver left it in the exact right place and time. Would definitely use this company again, thanks so much.

Title

Eve Harland | December 2025

OFFICIAL SUPPLIERS OF:

FAQs

Got questions? We’ve got the answer...

When will my order be dispatched?

Spare Parts Shipping
We ship in-stock spare parts the same day if ordered before 3pm. These orders are sent with DPD as standard and will be shipped on a Tracked Next-Day service.


Tanks & Supplier-Shipped Items

Tanks and certain spare parts are shipped directly from our suppliers. We aim to submit supplier orders to the supplier on the same day your order is placed to ensure prompt processing. 

How much is delivery?

Delivery costs vary depending on the type of product:

 

In-stock Spare Parts: £8.20 - shipped via DPD on a Tracked Next-Day service.
Supplier-shipped Spare Parts: £15 - dispatched directly from the supplier.
Tanks and Sewage Treatment Systems: Free Delivery to most mainland UK postcodes.

 

All delivery charges are calculated accurately at checkout.

I need help with placing my order.

No problem! Here are a few ways we can assist you:

Live Chat: Click the chat icon on the bottom right of the page to speak with our team instantly.
Call Us: Reach us at 01388 537050 during business hours for quick support.
Email: Send your query to sales@direct-drainage.co.uk, and we’ll respond promptly.

Do you stock all tanks and sewage treatment systems?

We do not stock tanks and treatment systems as standard. These are supplied directly from the manufacturer. The lead times of these systems will vary. If you need an accurate delivery date, please contact us on 01388 537050.

Are your prices inclusive of VAT?

It is important to note that all prices listed on our website exclude VAT. VAT will be calculated at checkout. 

I've found the same item somewhere cheaper, can you match the price?

We always aim to offer competitive pricing. If you've found the same item cheaper elsewhere, let us know — we'll do everything we can to match or even beat the price.

 

Contact us directly on 01388 537050 or drop us an email at sales@direct-drainage.co.uk.