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How to Measure your Water Filter Tube Size

Water filter tube sizes are always measured by Outside Diameter (ie edge to edge) 

Industry-standard water filter tube sizes are:

  • 1/4 inch / 6.4mm - The most common size in the UK
  • 5/16ths inch / 8mm - This is less common. Often used by German manufacturers like Brita
  • 3/8ths inch / 9.6mm - Often used with water filters with “spigots” ie male parts at the inlet / outlet
  • 10mm - Common with American water filters
  • 12mm - Often found with water filter taps

It’s easy to find straight connectors ie to convert one size tube to the other. Checkout our Tube size combinations chart

And/or see our spare parts page (Tip: use your browser search (eg Ctrl F) to find the right part.)

Also see general info on water filter connections

This quick video show you how to measure your water filter tubing.

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    Such an improvement over unfiltered water. Losing microplastics, scale, chlorine and all the other nasties that can work their way in is just a bit of piece of mind for me in relation to my kids.
    – Nick Love
    I've had the filter installed for 1 month now and the water tastes loads better and no more smell of chemicals, just clean fresh filtered water I'd say it's the best water I've ever had.
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