Inverted Flare Steel Plugs Pack Review

Just bought these to seal the connections while working on the car. Without Teflon tape, even gravity won't seal. I can't imagine they will ever seal actual working pressure.

The larger 9/16 x 18 plug I tried on a GM master cylinder leaked immediately. The plug is tapered, but the center is not deep enough to properly fit into the cone of most master cylinders. As others have pointed out, the larger forks don't have a hex head. They are hexagonal heads. Luckily I had an old set of connectors that I used for this project. I would look elsewhere if you want something that actually works.

Not as advertised. The 1/2-20 plugs did not have a hex head as shown. They were also useless to block my master cylinder port. I ended up filling the whole wall of the garage with brake fluid. I ended up using the plastic plugs that came with the new master cylinder. The 9/16-18 Allen worked well. I ordered a kit as I have both Ford and GM vehicles. Hopefully the smaller GMs will work when I need them.