Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
I always considered that valve usable for "limp home mode" or diagnostics. I doubt it would hurt anything to leave it closed, but I love my air assist and won't leave home without it!