This "fogger" nozzle is designed for use in the cockpit. It diffuses the Halon before it reaches the driver to reduce the chance of frostbite. This nozzle will not work with newer AFFF (foam) fire suppression systems.
SPA Design nozzles have a push-in connector designed for use with 1/4" Dekabon Tubing (Part No. 2456-.250). They will not work properly with bare aluminum tubing.