Graduated with double scale from the bottom PTFE stopcock, these cylindrical addition funnels have a pressure equalizing sidearm with Standard Taper 2mm PTFE stopcock, allowing the funnel to be refilled without opening the system to the atmosphere. They feature the same size Standard Taper joint at top and bottom - bottom with sealed-in drip tube. Scientists rely on the expertise and artistic skills of Wilmad-LabGlass' engineers and glass specialists to manufacture NMR and EPR consumables and laboratory glassware of the highest quality. Used daily in academia, healthcare and chemical, petroleum and other industrial applications, Wilmad offers 7000+ items as part of their standard catalog as well as custom fabrication for individual glassware, glass repair services and OEM glass parts.