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When working with pump tubing of small size (#13, #14, Orange-Yellow, and Yellow-Blue), it is necessary to use microbore tubing to hydraulically connect the pump to the experimental apparatus. The microbore tubing most commonly used in the lab is PTFE with OD of 1.7 6 mm (0.0661/16") and ID of 10.1 8 mm (0.0421/32"). This tubing can be purchased at Cole-Parmer. To connect the microbore tubing to the peristaltic pump tubing requires a barbed tube fitting sized for tubing of 1/16" ID  (can be purchased at McMaster-Carr), shown below. (Note: The fitting depicted below can split after undergoing the procedure shown below, so larger 1/16" fittings are recommended.)

This barbed tube fitting inserts easily into the small diameter pump tubing as shown below.

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