Add a brass drain plug to your cooler.
Yes, it’s easy enough if you have a drill and the right parts.
You need a bulkhead fitting or a threaded drain plug – pick brass or stainless steel, not plastic. Plastic cracks when you look at it wrong. Find the lowest point on the cooler’s side (usually the corner near the bottom). Drill a hole slightly smaller than the fitting. Screw it in with a rubber gasket on both sides and a dab of silicone sealant on the threads. Tighten just enough to hold – coolers are plastic and you can crack the wall if you get carried away.
That’s it. Now you just unscrew the plug to drain. The brass will last forever, doesn’t rust, and looks like it came that way. Skip the cheap plastic boat drain plugs – they strip out.
Future you will thank you when you’re not wrestling a soaking wet cooler.
