I have a new set up to use for the drain port same location, but the fittings might be easier to purchase and install. I’m waiting on them to come in the mail. I’ll post a new video if it’s cheaper and easier and faster to do.
I just bought a Yeti Drain Plug Hose Connection. Perfect thread match to the existing FishPro cooler ports. Remove the factory plug and replace with the Yeti. Then just bought a garden hose ball valve and attached a 1 ft long piece or garden hose. Voila! Done. I have no need for using it as a livewell so no big deal.