This heavy-wall borosilicate glass bottle has three PTFE valves with Tefzel keys.

Pressure-tight PTFE coated Fluoron forms a seal within the cap; hence, fluid contact is restricted to glass, PTFE and Tefzel. The three individually controlled valves permit the application of gas under pressure to the bottle for venting, flushing, or delivery of the bottle contents to one or two points. Bottles may be pressurized in isolation or in series with the other bottles. One of the valves may be used to allow corrosive fumes to be vented safely. Rated to 14 psi at ambient; must be adequately shielded when under pressure. Each bottle is provided with a three-valve, 1/4-28 UNF cap.