Internal Autodrains
Compact Tanair internal float drains for automatically removing condensate from compatible compressed-air equipment without relying on a timed electrical drain cycle.
Tanair Internal Float Autodrains
The current range contains two compact internal autodrains: a 1/2" internal float drain and a 3/8" plastic-type internal autodrain.
These products use a float-controlled mechanism rather than a timer. Condensate collects inside the drain and the internal float operates the valve when the liquid level rises.
Internal autodrains are useful where automatic condensate removal is required without adding a separate timer-controlled electrical drain.
Shop Internal Autodrains
The 1/2" float drain is shown first, followed by the 3/8" plastic internal autodrain. Live pricing and stock are pulled directly from WooCommerce.
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Internal AutodrainTanair 12-IFD | 1/2″ Internal Float Drain/ Autodrain
£49.50 exc vat. Add to basketA Tanair component for compatible compressed air installation, repair or maintenance work.
In Stock£49.50 exc vat. -
Internal AutodrainTanair D11638 | 3/8″ Internal Autodrain (Plastic Type)
£31.03 exc vat. Add to basketA Tanair component for compatible compressed air installation, repair or maintenance work.
In Stock£31.03 exc vat.
Choose the Correct Internal Autodrain
Tanair 12-IFD · 1/2"
Internal float drain / autodrain for compatible compressed-air equipment requiring a 1/2" connection.
Tanair D11638 · 3/8"
Compact plastic-type internal autodrain for compatible installations requiring a 3/8" connection.
How an Internal Float Drain Operates
Condensate entering the drain collects in the internal reservoir. As the liquid level rises, the float mechanism operates the valve and allows the collected condensate to discharge. Once the level falls, the valve closes again.
This means drainage is linked to the actual condensate level rather than opening at fixed time intervals.
Which Type of Automatic Drain Do I Need?
Internal Float Drain
Operates mechanically from the condensate level and is commonly fitted inside or directly to compatible filter, receiver or treatment equipment.
Timer-Controlled Drain
Uses an electrically operated solenoid that opens for a preset period at regular intervals. Electrical supply and timer settings must be considered.
Where Are Internal Autodrains Used?
- Compressed-air filters and filter housings
- Air receivers and local condensate collection points
- Air-treatment equipment
- Workshop and industrial compressed-air systems
- Installations where regular manual draining is inconvenient
Check Compatibility Before Ordering
Connection Size
Confirm whether the installation requires the 1/2" or 3/8" drain.
Existing Reference
Match the part number where possible. The current Tanair references are 12-IFD and D11638.
Available Space
Internal drains need sufficient clearance to fit and operate correctly inside or beneath the equipment.
Equipment Application
Confirm that the drain design is suitable for the filter, receiver or treatment product being serviced.
Internal Autodrain Maintenance
- Inspect the drain if condensate begins building up unexpectedly
- Check for dirt, rust or contamination restricting the mechanism
- Confirm the float can move freely
- Inspect seals and valve components for wear or damage
- Fully isolate and depressurise the compressed-air system before removal or servicing
Need Help Identifying an Internal Drain?
Compressed Air Systems UK can help identify suitable replacement drain components for compatible compressed-air equipment.
Internal Autodrain FAQs
How many internal autodrains are on this page?
The current range contains two Tanair products: the 1/2" 12-IFD and the 3/8" D11638 plastic-type internal autodrain.
How does an internal float drain work?
Condensate raises an internal float, which operates the drain valve. The valve closes again after the liquid level falls.
Does an internal autodrain need an electrical supply?
The float-operated products on this page are mechanical internal drains rather than timer-controlled electrical solenoid drains.
Can I replace a timer drain with an internal float drain?
Not automatically. Confirm the equipment design, drain reference, connection, pressure and available installation space before changing drain type.
What connection sizes are available?
The current range includes a 1/2" internal float drain and a 3/8" plastic internal autodrain.
Why might an internal autodrain stop working?
Contamination, restricted movement, worn seals or a blocked valve mechanism can prevent reliable condensate discharge.
Can Compressed Air Systems UK help identify the correct drain?
Yes. Send the existing part number, equipment model, serial number and photographs, or call 0121 753 3330.
Need Help Choosing an Internal Autodrain?
Send us the existing drain reference, equipment details and connection size and our team can help check the correct replacement.
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