These are replacement nozzles for 15mm Naan Impact plastic sprinklers.
High quality plastic construction
UV Resistant
Colour coded to match existing systems
Recomendation:
As water travels through the nozzle, it can slowly wear out the nozzle over time, creating a change in the rate of your water application. A yearly check on your nozzles is recommended depending on your slit content; this will maintain the nozzles emitting the correct rate of water as well as to check for general wear and tear.