Drink system for use with ST4 & ST5 Helmets. This kit includes all the required parts for the helmet side of the drinking system. Designed to be fitted using the existing spare port on ST4 Wide, Formula and Rally helmets and most ST5 helmets. Includes Stilo male quick connect fitting, tube and Camelbak bite valve. To complete the system the car side drink systemÂ is required – see related items below.