Exceptionally light and easy to use, the Platypus GravityWorks PushPull Adapter allows any GravityWorks system to filter directly into any Platy bottle fitted with a PushPull cap. For filtering directly into your hydration reservoir, simply remove the blue end and plug the white adapter directly into your hydration hose or shutoff valve with the bite valve removed. Refilling a reservoir in the field was never so easy. BPA free. Connect GravityWorks microfilters to Platypus PushPull caps. Remove blue adapter to filter directly into most shutoff valves and drink tubes. Wt. 0.5 oz. Made in US of US and Irish parts.