The red nipple for the ST-73 indicates that the foamer is set up with a 1.5mm nozzle.
#Nozzles must be selected and installed based on the specifications of the pressure cleaner being used.
Please note: the nipple serves as an easily visible indicator of the internal nozzle’s sizing and connects to the chemical pick up hose in the foamer. This nipple is used on both models of the foamer (ST-73.1 and ST-73.2).
Use the specifications of the pressure cleaner to determine the nozzle sizing required. *See the chart on final page of the document below (Product Information tab).
