The most compact and inexpensive holders that we offer, these adapters feature 3AN male to 1/8 NPT female. Thus, they work with all popular water/meth nozzles. Use these for installations with multiple spray locations.
Larger 4AN (or 1/4") tubing is great for bulk fluid delivery. -for transporting the entirety of the required flow volume. Use that between a pump and a large single nozzle, for example. Whereas, small diameter 3AN (or 3/16") line is the best for multi-nozzle control accuracy. It's naturally perfect for direct port injection. There, reduced circuit volume also minimzes vaccum siphoning and draining.