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Plastic tube – Polyethylene, nylon and polyurethane conforming to the tolerances shown below. For soft tubing or thin walled tube we recommend the use of tube inserts.

Braided tube – Use of tube to hose stems is essential when using braided tube or hose. The use of clamps to retain braided tube on barbs is recommended.

Metal tube (soft) - Brass, copper or mild steel conforming to the tolerances below.

Metal tube (hard) – We do not recommend super Speedfit® fittings for hard or chrome plated tubes. This includes stainless steel and other polished metal tubes.

It is essential that outside diameters be free from score marks and that the tube be deburred before inserting in the fitting.

Tube Tolerances
Super Speedfit® fittings are offered for tubes with outside diameters to the following tolerances.

Size (inches)

5/32” – 3/16”

1/4” – 1/2”

Tolerance (inches)



Size (mm)

4 mm – 5 mm

6 mm – 22 mm

Tolerance (mm)



Title: What type of tubing can be used with the John Guest® fittings?
Description: Tubing recommendations for John Guest® Super Speedfit® Fittings
Published: 1/24/2012
Last Edited: 9/19/2013
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