Internal nuts
![internal ZDV nuts](images/nuts.jpg)
Internal nuts are for use with all standard Valco internal fittings and most valves, with sizes for tubing from 1/32" to 1/4" OD. We also offer a specialty controlled radius nut, which facilitates tight bends in the tube as it exits the fitting, helping to prevent tubing kinks.
External nuts
![external ZDC nuts](images/ext_nuts.jpg)
External nuts are for use with external fittings such as our ECEF series column end fittings and EZU and EZRU unions.