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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
If your system is tight, and doesn't leak, just leave the bottle open all the time.
But that puts a lot of pressure on the nitrous and the purge solenoids, and they usually don't like holding back 1000 or so PSI 24/7. Not to mention keeping the constant pressure on the lines as well. Usually after the bottle is closed, I purge the line and relieve all the pressure.
You know how I feel about site sponsors and people on the site who help out / sell stuff ... A long as it will fit my bottle with no problems (and it looks like it will) then consider it a deal!