The patented double-screw attachment works on all regular auto Schräder valve stems (bicycle owners please note: you must have removable-core type Presta valves to dispense OKO through the valve core, check before purchasing). It avoids leakages, allowing mess-free application of OKO sealant. You can suck up the required amount of OKO from the bottle (having unscrewed the cap) by pulling up the plunger of the syringe. A Schraeder-sized valve core remover is provided: it screws onto the end of the screw attachment