I hope it works. I've tried draining my gray water tank with a hose (my tanks have a hose attached to the lid for exactly this purpose), but it took me a while to get the flow through the hose and down the drain. I don't know if there was too much pressure in the garden hose or what. Next time I slowly open the gray valve. However, I was always afraid that the hose might fall out of the drain, which is why I bought this product. I'll find out soon but haven't used it yet.
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