Silca Hiro V3 Carbon Steel Side Lever Locking Disc Chuck Silca gets it, with these precision pumps and pump parts capable of feats far beyond what you need to simply inflate tires. For example, the Silca Hiro V3 Carbon Steel Side Lever Locking Disc Chuck can hold 300 psi from your Silca Super Pista Pump, not that you'd want that, but it can. And there's no hose clamp here. This locking chuck has what you'd call a lollipop lever on the side, allowing single-hand usage, which is perfect for the professional road and track mechanics who use this chuck. It swivels too, meaning no hose twisting when the valve stem and wheel orientation aren't exactly lined up with the pump. Works with both Schrader and Presta valves. Specifications:Designed for use with the Silca Super Pista Pump Material: carbon steel, guaranteed for 25 years Uses proprietary 254 gasket not backwards compatible with Hiro | Silca | Hiro V3 Carbon Steel Lever Chuck Side Lever Locking Disc Chuck