Combined with a "plumbing-dept" rubber pipe connector, these work well for all my shop tools. The plumber connectors are the key as they are available for every standard size port you might need. They come as 2:2 or 2.5:2 or 2:3.0 etc. They use a clamp on each end so the ports are tight and right. Order several at once or you pay more for freight than the tool !!