I have a small Craftsman air compressor that I needed an oil fill plug for. I had broken the original plastic plug and was unable to find the part due to Sears going out of business. Not being able to verify the thread, I could not even find a simple metal plug as a substitute. Then I happened on this website, ordered the part and had it in a week or so. The shipping cost more than the part but I was saved the hassle of trying to find a substitute at probably close to the total cost paid anyway.