Stay hydrated with the patented SpeedfilTM F2 system. The F2 works with any Specialized thread compatible water bottle in both 21 fl oz. (621 ml) and 24 fl oz. (710 ml) sizes. . The F2 model enjoys many of the same benefits as our standard Speedfil. The dual splash resistant design allows the rider to refill the system on the fly. Simply prime the Speedfil system once and you have access to your hydration immediately. The bite valve and tubing keep fluid on demand without sucking up air for each drink. The F2 works with any standard cage mounted on the down tube. This also allows for simple mounting and cleaning. The F2 can be used by triathletes, mountain bikers, as well as recreational riders. The F2 is the utility player of the Speedfil product line. Works with any Specialized thread compatible bottle Easily refillable on the fly Exclusive dual splash resistant design Bite valve holds fluid at the ready Easy to mount and easy to clean
