In article >,
tom > wrote:

> I would like to find r12 substitute for my old a/c system.

No problem. The EPA supplies a whole list of acceptable
alternative refrigerants at;
http://www.epa.gov/spdpublc/snap/ref.../macssubs.html

> Local stores in the LA area pep boys, auto Zone, etc, say I need a
> license to buy the environmentally safe stuff, yet is available online
> with no such requirement.

Many states have their own licensing requirements, some only
require the purchaser to have the "609" certification. Check the
laws in your state.

> Questions:
> Are there really any restrictions on the e-safe stuff?

There are restrictions on -any- substance introduced into a
mobile (automotive for highway use) air conditioning system.
Fill your AC system with Lime flavored Jello, it -still- falls
under the EPA rules, no exceptions.

> How do I get this into an old system? All the new cans appear to be
> the r134 screw on type, rather than the puncture top cans.
> I don't want to replace my valves because my old type pressure gauges
> will not work with the newer valves.

All substitute refrigerants are required to use individually
unique service fittings, this helps eliminate cross contamination
during recovery and recycling. Had the rules been more
diligently followed over the last 15 years, the equipment
requirements for the people and businesses who legitimately
service automotive AC systems would be a whole lot less and the
costs to the consumer a whole lot lower.

> What I would like is a filler hose with the newer type tap end for
> the can, and an attachment that can be used to fill my existing system
> thru the original valves on the compressor. This would enable me to
> use R134 leak detector, as well as envirosafe, or some such similar
> product to recharge the system.

I've never seen a leak detector, R-134a type or any other used to
recharge a system.
I think it's entirely reasonable to contact the refrigerant
manufacturers listed in the EPA SNAP list to see if they have
available adaptors to convert your R-12 manifold and gauge set to
use with their product.
If you live in the United States, be advised, it is illegal to
use hydrocarbon based refrigerants such as Envirosafe (ES-12a) in
any mobile air conditioning system.

> Any suggestions?

Please don't contribute to making things worse than they already
are.