This statement is from Luxfer's Website and describes their
policy on older tanks.
Luxfer's
link
We will Fill Tanks according to this policy.
Policy statement concerning replacement of U.S.
scuba cylinders made from 6351 aluminum alloy

February 4, 2004 — In the United States throughout 2003, Luxfer Gas
Cylinders conducted a trade-in program for older Luxfer scuba cylinders made
from 6351 aluminum alloy from 1972 through June 1988. That trade-in program
ended on December 31, 2003. In prior years, Luxfer conducted various other kinds
of rebate and replacement programs.
All such replacement and trade-in programs have now ended, with one
exception: Certain older Luxfer scuba cylinders sold by U.S. Divers were issued
with a lifetime warranty. This lifetime warranty will continue to be honored for
the life of each cylinder so warranted. However, since this warranty was
non-transferable, it will be necessary for those wishing to make warranty claims
to prove that they are original owners of any cylinders in question. There are
several ways to prove original ownership, including warranty certificates, cash
register receipts, and records maintained by merchants. Luxfer Customer Service
will be glad to assist in establishing original ownership by those wishing to
make legitimate warranty claims.
All other Luxfer scuba cylinders made from 6351 alloy are now out of warranty
and no longer eligible for replacement, rebates or credits. To determine whether
a cylinder is made from this alloy, consult the Luxfer website (www.luxfercylinders.com)
or call Luxfer Customer Service at 800-764-0366.
This policy statement is not a recommendation to discontinue use of older
Luxfer scuba cylinders made from 6351 alloy, nor is it a product recall. As long
as such cylinders are inspected in accordance with Luxfer requirements and can
be requalified according to regulations established by the U.S. Department of
Transportation, they can continue to be used indefinitely. For information about
inspection requirements and other pertinent safety information, please visit the
Luxfer website or call Luxfer Customer Service.
This policy statement supersedes all other policy statements and programs
concerning Luxfer scuba cylinders. If you have questions about this Luxfer
policy, please call Luxfer Customer Service toll-free at 800-764-0366.