drain hose for chest freezer

Question

I'm trying to build a DIY ice bath (Wim Hof style ice baths) using a chest freezer.

I have a Magic Chef small size chest freezer (pic below). I need to drain the water in it every couple of months or so. There's a drain hole inside the freezer with a plug. And there's a small drain outlet to the side. The outside drain hole is smooth on the inside, and has no threading. I thought it was 1/2" wide and got a 1/2" pipe joint from the hardware store. However, the joint is too large for the hole. My question is:

1. How to I go about sizing it (I tried using a measuring tape last time but apparently that didn't work. Anyone got an easy hack to do this?)

2. Is there a name for the kind of joint I should be looking for?

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The drainage outlet is to the bottom-left of the freezer in the pic below.

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I've put my index finger tip near the hole to help understand its size better.

Answer 1

A siphon might be better if it is a lot of water.

1: No hose will fit in. That drain hole has a flat side. I wondered what sort of plug thing would go it. The answer looks like "none". The instruction manual https://c.searspartsdirect.com/mmh/lis_pdf/OWNM/L0702364.pdf says that water should just drip out into a pan. Another source recommended a bunch of towels.

2: You will need to reach through all the water to unplug the drain. Doable but not fun. I hope you have long, orangutan like arms for this endeavor, and in general.

3. Siphon. I think you might be better off siphoning the bulk of the water out. You can siphon it out with a garden hose to the drain. You won't have to get wet or use all your towels. I change the water in my aquarium this way. If you want every last bit you can get that with the drain hole and the pan.

4. Are walls strong enough for this use? I worry that if this freezer is really full of water and ice it will produce a lot of lateral pressure on the walls. I do not think the walls of a freezer are made to withstand that kind of pressure. Make sure the environment of this freezer will be safe if a wall comes loose while you are out of town.