AirSep MN155-1 - Manual (Page 12)

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2.3 Apply Teflon tape to the new inlet/outlet valve.
Figure 11
2.4 Using two wrenches hold the inner nut in place with one wrench (7/16 inch) and
screw in the outer nut of the valve with the other wrench (5/8 inch).
Figure 12
2.5 Leak Testing
After any servicing is complete, the SureFlow should be checked for leaks,
Attach to oxygen source and using soapy water or a leak test solution, check
all tubing connections before closing.
Another aid in determining the source of a leak(s) is to put your thumb over
each outlet at the SureFlow station, on at a time. The flowmeter ball must drop
to zero on each test, indicating no leak within the SureFlow.
2.6 Replace the back cover after leak testing, and use three screws to complete the
inlet/outlet valve replacement.