Selecting the correct tube size ensures a secure, leak-free connection and reliable performance with DOT brass fittings. Choose the tube diameter that best fits your application. If you don’t see the size you need, contact us and we’ll work with you to provide exactly what you’re looking for.

Alkon Extreme Brass Push to Connect fittings follow a clear and consistent nomenclature for tube sizes. Each size is based on its measurement in sixteenths of an inch. For example, a 3/8″ tube O.D. corresponds to a “6” in the part number. Part number XQ64-DOT-6 illustrates this, representing a 3/8″ diameter, which is equivalent to 6/16.


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5/32″ Tube Size

1/4″ Tube Size

3/8″ Tube Size

1/2″ Tube Size

5/8″ Tube Size

3/4″ Tube Size