Cannot be tightened enough to stop leaks. The threads on the cap are too fine, causing it to "pop" out of the threads before it's tight enough to seal. The elastomer in the cap is thin but could potentially seal if tightened. I'll see if I can change another cap and find an o-ring to seal it if it works. WILL NOT work as intended. I gave it two stars as the spout looks functional if I can make a lid that fits and closes really snugly.
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