One of my modules doesn't seem to be holding or building pressure. What should I do?

First, be sure Synthetic Grease w/PTFE (Part #: RF41) was used on the lip of the bottle and the lip of the septa port on bottles so equipped. This aids in making a tight seal. Second, inspect the gasket which seals the module top to the bottle. It is important to do this before each run starts. If the gasket is loose, has slid to one side, or is showing signs of wear and deterioration, replace the gasket. Reference RF Service Procedure Gasket Replacement (RFS011). After inspection and, if necessary, replacing the gasket, test the module per RF Service Procedure Module Testing (RFS001).