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Shape"T"handle,inside hose is been fixed by card slot, and the water can't go through. If stick the needle into the mushroom bag, the spring will be pushed up, drive the card slot up, then the hose will recover to normal, and water go into the mushroom bag (no need of switch, it will inject water automaticly when stick the needle into mushroom bag).
edible fungi cultivation use water filling needles
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