DURR ECOGUN 2100 Aircaps
10-30 Aircap is for Nozzle with less than 30 degree angle so any nozzle that starts with 1,2,3 for example 207.
40-130 Aircap is for Nozzles that have an angle from 40 to 130 degree angle so nozzles starting with 4,5,6,7,8,9 for example 411.
Round Aircap will give you a round fan pattern (circle) round nozzles need to have round aircap.
Tips Sizes Available
Round Nozzles (needs round aircap)