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Charles Austen ET120AO Air Blower 120 l/pm

£129.00
£154.80 (inc VAT)
£129.00 (exc VAT)
2 IN STOCK — READY FOR DISPATCH
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Product Description

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

Why Buy Spare Parts from Direct Drainage?

Next-Day Delivery

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

Best Price Guarantee 

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

Stocked & Ready to Dispatch

A wide range of essential spare parts held in stock for fast, reliable dispatch.

Trusted Support

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

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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

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FAQs

Everything you need to know about replacement spare parts, compatibility and next-day delivery.

What spare parts do you stock for sewage treatment systems?

Direct Drainage stocks a wide range of replacement parts and maintenance components for sewage treatment systems, air blowers, pumps and wastewater equipment.

 

Our range includes air blower diaphragms, filters, service kits, replacement fittings, electrical components and other essential spare parts.

 

We supply components for equipment from leading manufacturers, including Klargester, Secoh, Charles Austen, Hiblow and other established wastewater brands.

Product availability varies, so please check the individual listing or contact our team if you need assistance locating a specific component.

How do I find the correct replacement part for my equipment?

Finding the correct replacement part depends on the manufacturer, model and specifications of your existing equipment.

 

We recommend checking the model number, manufacturer part number or identification plate before purchasing.

 

For sewage treatment systems and air blowers, it's particularly important to confirm compatibility, as similar-looking components may not be interchangeable.

We have also added handy filters to help you find the exact part you need!

 

If you're unsure which part you need, contact our team on 01388 537050.

 

You can also email photographs of your existing component or equipment identification plate to sales@direct-drainage.co.uk, and we'll do our best to help identify a suitable replacement.

Are your replacement spare parts genuine manufacturer components?

Our range includes genuine manufacturer spare parts alongside selected compatible replacement components.

 

Genuine components are produced or supplied by the original equipment manufacturer, while compatible alternatives are designed for use with specified equipment.

 

The type of replacement part supplied will be identified in the individual product information wherever applicable.

 

Always check the product description, manufacturer and compatibility details before ordering.

 

If you specifically require a genuine manufacturer component, our team can help confirm availability.

How do I know if a spare part is in stock?

Stock availability is displayed on our product pages wherever this information is available.

 

Products held in our warehouse can usually be dispatched quickly, with next-working-day delivery options available on eligible orders.

 

Some specialist components may be ordered directly from the manufacturer and have longer delivery lead times.

 

If your replacement part is urgent, we recommend contacting our team before ordering to confirm current stock availability and dispatch arrangements.

How much is delivery?

Delivery costs vary depending on the type of product:

 

In-stock Spare Parts: £9.50 - shipped via DPD on a Tracked Next-Day service.
Supplier-shipped Spare Parts: £15 - dispatched directly from the supplier.

 

All delivery charges are calculated accurately at checkout.

What time do I need to order for next-day delivery?

We aim to dispatch in-stock spare parts on the same working day when orders are placed before 3pm, Monday to Friday, excluding public holidays.

 

Next-working-day delivery is available on eligible orders when the appropriate service is selected at checkout.

 

Orders placed after the cut-off time will normally be processed on the following working day.

 

Please note that dispatch and delivery times can occasionally be affected by stock availability, courier delays or other circumstances beyond our control.

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.