i would fit a tap on it too before that connector, as i have found when the water gets low in the tank and say you go down a hill water from the pump and hosing drains into the tank and can cause slight airlocks that mess the flow rate a bit so what i do is when the water is low in the tank i just close the tap to stop any water flowing back into the tank and stops me getting air trapped in the pump and hosing (hope that makes sence)
paul