Specification Sizes (mm): 12, 16, 20 Emitter Spacing’s (cm): 20, 30, 40, 50, 60, 75, 90, 100 Nominal Discharges (lph): 12 mm: - 2.3, 4.0 Nominal Discharges (lph): 16mm - 1.1, 2.2, 4.0, 8.0 Nominal Discharges (lph): 20mm - 2.2, 4.0