Labconco FreeZone and FreeZone Plus 6, 12 and 18 Liter Freeze Dry Systems 79600 Series - Manual (Page 49)

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Chapter 7: Troubleshooting
Product Service Domestic 1-800-522-7658, International 816-333-8811
7. Make sure that the sample valve bulkhead nuts are tight.
Either tighten by hand or use the wrench supplied with
chambers. To use the wrench, first remove the knob and
stem assembly and also the valve body. The pins on the
wrench fit into the round holes of the nut. The nut should
be snug, but avoid over-tightening. Replace the valve
body, knob and stem assembly.
The illustrations below show how the sample valve installs on
a chamber and a manifold.
Valve Assembly (Clear Chamber with Valves)
Knob & Stem
Assembly
Valve Body