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- To: Aquatic-Plants at actwin_com
- Subject: Regulator threads
- From: JOlson8590 at aol_com
- Date: Sat, 19 Apr 2003 23:46:34 EDT
The "standard threads" for several regulators are changing. The most common
one you will see is the "new" threads on Propane Tanks. It is an Acme
Thread. The "old" thread is still there. The idea was, if you put in
modern o-rings and a big, coarse Acme Thread, coupled with a BIG (large
diameter) "coupling nut" you would eliminate virtually all of the fires, etc.
from improperly tightened regulators. Supposedly there are modern o-rings
that are not affected by flammable gases or Oxygen.
It may be that a "new" thread is actually appearing on CO2 tanks.
Regardless, a thread with a flat top will NOT work with a coupling nut
designed for a full V thread. There is always a difference in thread count,
i.e. threads per inch. You can "start" a nut on a close mis-match, but you
won't get more than a turn or two before it all jams. It does not take much
of a mismatch or leak at the tank to waste most of your CO2 into the air.
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