Kantleak™ Instrumentation Ball Valves are designed with double o-ring stem seals to provide over 20,000 leak free cycles.  They are also designed with an exclusive stem seal that never needs tightening and 9/16" panel mount for instrumentation applications.  For systems with working pressures up to 1500 psi. 
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Common Applications: 
Panel Applications
Vacuum
Oxygen 
Carbonated/Cold Temperature