well not exactly an ASA but it is a thread saver that goes between your tank and your ASA. it will add roughly an inch to the ASA but it has ON/OFF WITH Purge!
havent gotten my hands on one yet to see if its worth the $30 but so far it looks promising and the people on PBN are saying decent things about it

can buy here
http://www.actionvillage.com/is-bin/...QAAAEWlrNxB_4w
havent gotten my hands on one yet to see if its worth the $30 but so far it looks promising and the people on PBN are saying decent things about it
Inline On/off w/purge
Newest On/Off w/purge is 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. Click pic or here for larger view.
* 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
Newest On/Off w/purge is 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. Click pic or here for larger view.
* 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

can buy here
http://www.actionvillage.com/is-bin/...QAAAEWlrNxB_4w


i own one as well. and i just now realized what you meant by the 420sv
its late and i should be sleeping
.


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