Prestacycle Disc Wheel Presta Head For Disc wheels with Presta valves, a right-angle arm makes it easy to access tight places Stays on at high pressure better than others It's also compatible with Silca Pumps and can be adapted to other pump brands with our optional Schrader barb Made with 6061-T6 Alloy - it's as strong as Brass and only 1/3 the weight Uses industry standard 24.1 pump head washer (available in PUMP3015) Patent-pending 2-way connector screws onto the Prestaflator threaded connector or directly clamps to a hose