How to choose correct size of Laryngeal tube

The Laryngeal Tube is available in different sizes based on height of the patient.

no. 3 yellow: adult height < 155 cm

no. 4 red: adult height 155-180 cm

no. 5 violet: adult height > 180 cm

Connector and syringe are colour coordinate, so it is easy to recognize correct inflation volume during cuff inflation.