The one with the valve is the FW tank drain and the one without the valve is the FW tank overflow/vent. If you are on city water and not using the FW tank when you have the dripping, it is possible that the back flow valve in the pump is not properly seated and is allowing water to trickle into the FW tank and filling it so it overflows. If this is the case do the following
Turn off city water'
Turn on any faucet and allow to run until there is no flow.
Turn off faucet.
Turn on water pump and open faucet and let it run for 30 sec.
Shut off water and allow pump to run until it stops on its own
turn off water pump
turn on city water.
You should be good to go as this should reseat the back flow valve in the pump
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