Features:

• Used in between your bottom line ASA and your tank.
• Easy to use with a twist to turn outside ring
• Say goodbye to those hard to thread tanks once they start to air up
• Use on virtually any marker with a standard fixed ASA
• Small profile
• Prevents thread damage due to early tank air up "hard to thread on condition", normal with standard bottom line ASA's
• Turn outside ring to off, purges the marker lines for easy tank removal