With the resistance level set at 20, check tank is filled to correct level, as shown by the fill level indicator on the tank body. Check that the upper filling cap is tightened (this can be done with a large coin or a flathead screwdriver to seal up and prevent leaking). Tightening the cap by hand only may not seal the cap, and lead to leaking. The cap fits in the hole if you have the o-ring snug against the tank, it will then not leak. To test, fill up the tank, seal the cap, and row for five minutes. If there is any water pooling, you will need to tighten, and/or adjust the o-ring to sit correctly in the final groove of your tank cap. Note: the lower tank plug is permanently sealed.
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