Gradual Starter UZHE0Y08G 1/4″ Gradual Starter Size 0 – Min 2 Bar Pressure, 900l/m UHZE1Y10G 3/8″ Gradual Starter Size 1 – Min 3.5 Bar Pressure, 2200l/m UHZE1Y15G 1/2″ Gradual Starter Size 1 – Min 3.5 Bar Pressure, 2200l/m