Unit is a TLI Thermoinics Vacuum Products L-1500-H manual inline valve.

Manufactures description
-Bellows stem seal
-Opens and seals against atmosphere
-Less than 2 x 10-10 std cc/sec leak rate
-Mount in any position
-GTAW welded construction
-Stainless steel exposed to vacuum
Manually-actuated inline valves have an acme screw on the valve stem for rapid opening.

-Port size: O.D. 1.5"
-Conflat: 2.75"
-ISO/KF: 40
-s/n 890044

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