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Charles Austen ET40A Air Blower with Built in Alarm 40 l/pm

£75.00

(exc VAT)
£75.00

(exc VAT)
Quantity

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This product is delivered directly from the supplier, lead times vary.

 

The Charles Austen ET40A is a high-quality linear diaphragm air pump designed to provide a clean, oil-free air supply for septic tanks, sewage treatment plants, wastewater systems, and pond aeration applications. Featuring an integrated low-pressure alarm system, the ET40A provides reliable aeration while alerting users to potential airflow issues before they become serious problems.

Built for continuous operation, this compact and energy-efficient air pump is housed in a durable weatherproof casing, making it suitable for both indoor and outdoor installations.

 

Key Features

  • Delivers up to 40 litres per minute (LPM) of oil-free airflow
  • Built-in low-pressure alarm for enhanced system monitoring
  • Audible buzzer and bright LED warning indicator
  • Optional 230V output wire for connection to an external alarm panel or beacon
  • Quiet operation, ideal for residential environments
  • Continuous-duty design for reliable long-term performance
  • Weatherproof housing suitable for indoor and outdoor use
  • Low maintenance design
  • Compatible with genuine Charles Austen service kits
  • Backed by a 2-Year UK Manufacturer Warranty

 

Benefits

  • Maintains healthy oxygen levels in wastewater and treatment systems
  • Early warning system helps prevent unexpected failures
  • Reliable and energy-efficient operation
  • Compact design for easy installation
  • Suitable for domestic and commercial applications
  • Durable construction designed for year-round outdoor use

 

Suitable For

  • Septic Tanks
  • Sewage Treatment Plants (STPs)
  • Wastewater Treatment Systems
  • Pond Aeration Systems
  • Aquaculture and Fish Farming
  • Domestic and Commercial Aeration Applications

 

Technical Specification

Model: ET40A
Series: ET Series with Integrated Alarm
Power Supply: 220V to 240V, 50Hz
Maximum Airflow: 40 LPM
Operating Pressure: Low Pressure Aeration
Power Consumption: Approximately 30W
Connector Size: 14mm
Dimensions: 208mm x 150mm x 178mm
Weight: Approximately 4.0kg
Alarm Type: Low Pressure Airflow Monitoring
Alarm Indicators: Audible Buzzer & LED Warning Light
External Alarm Connection: Optional 230V Output Wire

 

Why Choose the Charles Austen ET40A?

The ET40A combines dependable aeration performance with advanced alarm protection, making it an excellent choice for septic tanks, sewage treatment systems, and pond applications. Its energy-efficient operation, weatherproof construction, and integrated warning system provide peace of mind and reliable performance all year round.


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.


Images are for illustration purposes only and may vary slightly from the actual product.

SKU: ET40A-4

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VERIFIED BUYER

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 BUYER

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 BUYER

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

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.