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Hi All, I repair bean to cup coffee makers on a regular basis and need to find a supplier of 4mm nylon pipe and in particular the crimps that are applied to each end. The pipe is 4mm outside diameter and 2mm internal diameter. If I knew the generic terminology it would help with my searches. Many thanks.

Do you mean high-pressure pipes with readily crimped ends, made from Teflon? Look for the appropriate length.