 
This is a legacy product, and replaced byVZM450-N01-08 VALVE, MECH L (TOGGLE). VALVE. VM BODY PT 1/4. .77161 lb.
Rated Vacuum Range: F (-100 to 100 kPa), Output Specification: N (NPN Open Collector 1 Output), Unit Specification: M (SI Unit Only), Piping Specification: N01 (NPT 1/8), Option 1: w/o Lead Wire, Option 2: D (Panel Mount Adapter + Front Protection Cover), Option 3: T (w/o Operation Manual, Calibration Certificate)
.: 09 (5/16"), Port Size/Applicable Tube: N01 (1/8" Thread)