Review on 🧴 Bottle Jack/Floor Jack Oil Reservoir Rubber Filler Plug Bung, 12PCS - Horizontal Jack Bung for Hydraulic Jack Oil Reservoir Filler Hole, 8mm by Mike Kimball

I had a Torin Big Red Jack. The instructions say to be careful not to tear the rubber plug when removing it to change the oil. Well I was careful but I ripped it anyway because it was tight and the rubber was old. These fit perfectly. I don't necessarily need twelve of them, but that's how they come. The landing was good and tight. If you're not sure what size hole to plug in because you don't have a metric ruler, 8mm is very close to 5/16 inch.