The Scubapro MK5 is a decent regulator, but parts are no longer available. You may be able to find some shops that will still have a few kits, but it will become more difficult. Some parts are pretty standard, but not all. It also depends on how old it is,
as the earliest models were not rated for 3000 psi. If it is, it will be displayed or stamped on the yoke. If you are looking to buy one of these used, keep in mind that
it will be at least 20+ years old and the hoses will probably be just as old. Hope this helps.
Terri