http://www.edibleacres.org
If you search float valve garden hose you can see many options online. I think I found a 6 pack either ebay or (hopefully not) Amazon, but I can't remember... This could very well be something that could be fabricated from parts since the idea is simple, and I'd love to hear if folks have done that.

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Edible Acres is a full service permaculture nursery located in the Finger Lakes area of NY state. We grow all layers of perennial food forest systems and provide super hardy, edible, useful, medicinal, easy to propagate, perennial plants for sale locally or for shipping around the country…
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Happy growing!