These high vacuum valves feature a barrel with two sidearms attached at a 180° angle to each other and on the same plane.

The borosilicate glass valve body features a precision-formed tapered valve seat and a precision tooled external thread. The design of cap (made of Delrin®) and valve stem provides a non-rotating primary seal. Interchangeable between valves of the same bore size, valve plugs have two PTFE seal rings that enclose Viton® O-Rings. This prevents exposure of the O-Rings to corrosive gases and liquids. An additional Viton® O-Ring behind the PTFE seal rings ensures the vacuum seal. The tip of the valve plug has a machined O-Ring shape and makes the primary seal to the barrel valve seat.