#000 Winter Plug 3/8” Swimming Pools & Spas 000 Winter Plug – 3/8 Inch – Stainless Steel Wings & Bolts – Heavy Duty Rubber (1)

This did exactly what I needed it to do. I’m using it for my pool pump motor to replace a plug that doesn’t seem to grip anymore. The only issue I had was that it kept slipping off of the bolt that it came with, so I switched the place of the washer and put a bigger washer on the bottom. It works great if your hole is bigger than the tip of the plug, but I would recommend you buy a set of washers.