I have a Mirro Craft 14′ troller with a live well which was installed by the manufacturer , now I have no issue with aerator set up however overflow will not work unless your out of water & even then have to remove overflow tube to empty tank ! water will come in through overflow and not allow water out while on lake so you have to have it plugged until you’re out & then pull or unscrew overflow tube to let water out . due to fact overflow port is alongside of aerator port under water. so how are you to use aerator to keep fish alive & replenish water as if I keep aerator on will overflow tank. There is an access switch attached to side but unaware what its for any idea’s to create an overflow to allow for circulation of aerator with fresh water without filling boat with water?