06-07-2010, 08:54 PM
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Ok this is just theory from my stand point as I have not done anything like it, but you might want something like this
, get the arm and float down to size and figure some way to mount it to the tank. I've never tried but you should be able to attach some plastic tube to that valve with some fittings, then simply put the tube in the water source that is above your tank, open the valve and start the siphon then close the valve when the water begins to flow and attach to the tank and it should maintain that siphon until the valve is opened by the float and start drawing water into the tank until it closes again.... in theory anyways.
Be careful what kind of valve you get as alot of swamp cooler stuff is copper which can leach bad stuff for your fish, you might even be able to find a smaller, plastic more suitable valve in the toilet repair section. But most of the stuff for toilets has become very complex and might be a pain trying to take it apart and make it work for you.