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On In-stock Spare Parts
Charles Austen ET40 Air Pump
Charles Austen ET80AO Linear Air Pump

Over 17,000+ Happy Customers

Charles Austen ET40 Air Blower 40 l/pm

£61.00

(exc VAT)
£61.00

(exc VAT)
Quantity
VERY POPULAR! ONLY 4 LEFT IN STOCK
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VERY POPULAR! ONLY 4 LEFT IN STOCK

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The Charles Austen ET40 Linear Diaphragm Air Pump is a reliable, high-performance oil-free air pump designed to provide efficient aeration for a wide range of domestic and commercial applications. Featuring a compact, weatherproof design, the ET40 is ideal for outdoor installation and delivers a clean, consistent airflow with low energy consumption and exceptionally quiet operation.

Built with advanced Green Drive Technology, the ET40 combines energy efficiency with long-term reliability, making it an excellent choice for sewage treatment systems, ponds, aquaculture, spas, whirlpools, and decorative water features. Its robust linear diaphragm design ensures dependable performance with minimal maintenance requirements.

 

Ideal Applications

  • Sewage treatment and aeration systems
  • Septic tank aeration
  • Pond and aquatic oxygenation
  • Koi pond aeration
  • Aquaculture and fish farming
  • Spas and whirlpools
  • Water features and fountains
  • Domestic and commercial wastewater treatment

 

Specifications:

  • Flow (l/min): 30
  • Pressure (bar): 0.12
  • Noise level (DB): 25
  • Power Consumption: 30W
  • Weight (KG): 4.3
  • Dimensions (mm): 208x 150 x 178
  • Outlet Size: 14mm

 

Key Features

  • Energy-efficient Green Drive Technology for reduced power consumption and lower running costs
  • Oil-free operation delivers clean, contaminant-free air
  • Long-life diaphragm material specially formulated for extended durability
  • Consistent airflow performance with no wearing mechanical parts
  • Robust, compact, and weatherproof construction for outdoor use
  • Suitable for continuous or intermittent duty applications
  • Easy to maintain with competitively priced service and spare parts kits
  • Whisper-quiet operation with noise levels as low as 35dB
  • Reliable performance for demanding aeration applications
  • Manufactured to the high standards of Charles Austen Pumps

 

Why Choose the Charles Austen ET40?

The Charles Austen ET40 Air Pump offers an ideal combination of quiet operation, energy efficiency, durability, and dependable airflow performance. Whether you need a sewage aeration pump, pond air pump, septic tank aerator, or aquaculture air pump, the ET40 provides a cost-effective and reliable solution for maintaining healthy oxygen levels and efficient aeration.

 

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 slightly from the actual product supplied.

 

Charles Austen ET Series Data

SKU: BLOBLOWCHA001

Agricultural Tanks Agricultural Tanks Agricultural Tanks

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Agricultural Tanks

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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

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.