The standard milKit valves have a usable length of 35 mm (1 3/8 inch), and they work for most rims except some special high-profile rims. For high-profile rims, there are 45mm, 55mm and 75mm versions of the milKit valves available. Click here to see the valve dimensions. To use the Booster bottle effectively, it is recommended that at least 15 mm of the installed valve should extend beyond the rim.