I think that next time I remove a brake line, I'm going to plug it so it doesn't leak all over. Since I'm to lazy to find the exact threading of the line I may just buy an assorted tapered plug set from Amazon. It's 10 bucks.
40 Pc 1/16" to 3/4" High Temp Silicone Rubber Tapered Plug Kit - Powder Coating Custom Painting Supplies https://www.amazon.com/dp/B00XYD2760/ref=cm_sw_r_apan_glt_fabc_8T5XXQCG9PW3WMX7E7SP?_encoding=UTF8&psc=1
An annoying problem with the APO is the silicone plug for the thermometer socket, which has a very tiny prong that is hard to insert (particularly when the oven is hot). Not to mention, some people have found that the plug breaks with use, and Anova can't provide a replacement.
Another thing I worry about is plugging the two pipes in the back of the oven when I clean it using Easy-Off.
So I bought some silicon plugs off Amazon to solve these problems. Admittedly, not the cheapest solution in the world (a 40 plug bag!), but they are on sale at the moment for $9.93.
https://www.amazon.com/dp/B00XYD2760?psc=1&ref=ppx\_yo2\_dt\_b\_product\_details
You might try trimming & drilling a silicone plug like they use for powder coating. Some might be found in smaller quantities on Amazon, eBay or a craft or metalwork supply shop.
Have you considered a silicone plug?
https://www.amazon.com/High-Temp-Silicone-Rubber-Tapered/dp/B00XYD2760
Yup, I just use these from amazon just find the right size and it should work.
I use these