These MCV and MCVT valves have fine, tapered needles to precisely control flow range. Ten turns from full open to complete shut. Pressure rating of 35 psi; 1 x 10-8cc/sec vacuum rating. Valves can be operated to 300°C. Seat of removable graphitized Vespel. MCV valves have L configurations; MCVT valves have T configurations to provide an extra port. Choose from 50 and 100mm stem lengths. Supplied with ferrules.