I discovered by happy accident that my Aqueon hose would not siphon until it was under some pressure. I turned it on at the faucet with the faucet end closed and the gravel vacuum end open so it had water going into the aquarium. Then I shut off the water flow on the gravel vacuum. It built up some pressure which I immediately let out at the faucet by opening the faucet end. I turned the faucet off and I opened the gravel vacuum end, submerged it and turned the faucet back on with the faucet end open and the gravel vacuum had a good strong siphon!