MKS Instruments Inc. - HPSR Products, Boulder, Co., published a catalog for HPSR high-vacuum valves. The catalog covers the Series 150/160 valves and the V-100 valves. The 8-p color catalog includes applications, specifications, dimensions and prices. The bellows-sealed vacuum poppet valves are constructed of stainless steel and include formed bellows. They range in size from 0.75 to 6 in. (19 to 150 mm). ISO-KF, ISO-Universal, CF flanges and weld stubs are available.