Replace the pressure relief valve.
An overflow is a box that hangs on the back of the tank (or is sometimes built in) and allows the water to "overflow" to a wet/dry filter (the tank sized filters people have underneath their tanks). The overflow has a U shaped tube that allows water to siphon from the main tank into the overflow box. The overflow box then drains the water down a tube to the wet/dry filter continuing the siphon by pulling the water as it drains. If you are going to purchase on, they should come with instructions. www.wetwebmedia.com is a good place to learn about all types of fish related things.
Are you sure where the water is coming from? (1) Could it be A/C condensation draining from condensate collector pan? (2) Could it be overflow from the radiator overflow tank? (3) Could it be leaking from the water pump (which could possibly signify imminent failure of the pump)? If you can answer all thes questions in the negative - then take it back to whoever did your gasket work and ask THEM.
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