Fit perfectly on my MasterCool Vacuum pump. I was looking to improve my vacuum times, I recently purchased a Yellow Jacket vacuum pump tree that had a 1/2" connection. The original connection was 5/16" and 1/4", which wouldn't work. This connection worked flawlessly, I tested it last night on a 30lb recovery bottle. I was able to pull down to 500 microns in 6min,27sec, which is amazingly fast. Using a set of Fieldpiece SMAN manifold typical time is about 20-30 minutes.
The brass fitting was perfect, no burs or blemishes. The treads were true and I was able to securely connect a my hoses to it. Superb quality, zero issues at a decent price. Thanks!