5 Gallon Water Fill Cap
thingiverse
I use it to fill up my 5 and 3 gallon water jugs from our reverse osmosis filter system. It accommodates a 5/8 OD hose perfectly. The inside diameter or ID is 1/2 inch, which fits our faucet's outlet snugly. Water doesn't need to touch the cap at all; simply push the hose down into place about two centimeters.
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