High vacuum stopcock with easy action plug that has blunt, flat end instead of the tapered end supplied with 8194 or 8195. This modification means stopcock is a quick opening model versus the variable opening 8194 and 8195. Vacuums of 10-7 can be realized with standard O-Rings. Plug is NOT bake able. Stem O.D., 0-14 is 19mm; 0-20 is 25.4mm. Supplied with FETFE O-Rings.