These worry-free polytetrafluoroethylene (PTFE) pourers have inert pouring surfaces — safely pour hazardous and corrosive chemicals. A breather vent allows direct and controlled pouring. Tethered strap keeps closure handy. Notch in tether keeps closure out of the way when pouring. A PTFE-encapsulated sealing ring ensures that bottle contents remain contaminant free. Fit standard reagent bottles; order bottles separately.