pippin88
It depends on what size and style you want?, I'm mainly using 8mm with clean outer shape (no extrenal nut hex), with 1/8bsp taper threads, that I usually turn into straight threads with a die nut, but I also have some other sizes. The best thing to do is get festo, (or one or their agents), to send you a paper catalogue if you don't have one, the online version is useless. These fittings are listed in the OD of the tube, and must be used with the correct type of tubing, (I'm using a transparent polyurethane).
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