Hi, I have started the d3 regimen about a week ago, I might have a go at making that redneck reservoir system. Is there no way to change the connector using an adaptor or could a new hose be fitted with the correct fitting. Is a regulator still needed, I thought that the demand valves worked off the principal of just opening the valve on the tank and worked off of the bottle pressure, have I misunderstood how they work.