I hate to bring this back from the dead and make a first post that's a plug but I was moved to finally join with this discussion found by a customer. Unfortunately (or fortunately, depending on how you look at it) the oxygen system described here is quite advanced and includes a lot of parts that make it expensive to repair or replace. It's always a tough pill to swallow when one expires.
Please don't forget about the condition of the pressure reducing and altitude compensated regulators installed on these cylinders. So often, we find equipment that is severely out of spec. Merely replacing the cylinder without addressing the functional test/overhaul of the regulators is a mistake IMO. The OEM recommends an overhaul every 5 years, in fact. There are also cylinders out there not FAA-approved that will cause problems if your unit is ever sent to a qualified FAA repair station. The HRD cylinder mentioned here is an example of an approved cylinder, a good option.
We offer a cylinder replacement with a new FAA-PMA approved unit, overhaul of the pressure reducing regulator, and functional test of the altitude compensated regulator for not much more than the cost of the cylinder mentioned here. This will be returned to you assembled, tested, leak checked, and ready to install.
In any case, I'm here to help
Brian
Compressed Gas Systems, LLC
FAA 2OXR299C
EASA 145.6416
brian@cgs.aero