ok the verdicts still out on this one, but have a look anyway. the object here is to be a ble to drain a tank to a predetermined level, w/out having to stand over it. can also be filled w/out having to hold the hose, but i don't recommend leaving the room while filling.
what ur looking at, is basically the business end of a python run through some sink piping, easily located at the hardware store. the other end gets drained on the lawn, then hooked back up to a faucet, for filling.
as u can see, the unit hangs all by itself. just close the lid on it. of course gravel vaccuming is not optional w/ this upgrade. the python debris cylinder can be cut to any lengh, to drain a specific amount of water. total cost...under $5.