What is the thread size of a Watercell X or ST fill cap? Can I connect a water filter to a Watercell? What is the thread size of a Watercell X or ST fill cap? Can I connect a water filter to a Watercell?

What is the thread size of a Watercell X or ST fill cap? Can I connect a water filter to a Watercell?

The Watercell X and Watercell ST have a 63mm threaded opening. This is the same size as a standard Nalgene bottle.

 

You can connect some water filters to a Watercell - any water filter with a 63mm thread will fit. 

 

Some water filters (especially those designed to screw into a drinking bottle) use a 42mm threaded connector. They will not fit the threaded opening of a Watercell.

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