The mouthpiece valves just pull out, the entire plastic cage assembly. You may have the gently pull the edges of the MP to break the tacky bond between the materials . You really should replace the valves, unless they are modern replacements, they are not acceptable for diving. The old rubber just did not hold up. The inserts are identical HOWEVER they must be installed in opposite directions to allow proper air flow.
A word of caution, it was common for the LP seat to be staked to the brass nut, it appears this one has been. The stem is brass and easily broken. I remove the nozzle as an assembly, you have to reach under the lever and remove the 2 screws and support levers then you can unscrew the assembly. It's a pain to do but can be done. With it removed you can hold the lower part of the LP seat holder and GENTLY work the nut DOWN (ON) a turn or 2. Next try to clean up the top threads with a tiny file or knife blade and finally work the nut off and on until it comes off. Back in the day, if you broke that part, the reg was not repairable, VDH has replacements now or you can use the HPR. If you get it off and want to reuse it, I suggest cleaning up the threads with a 5-40 die (NOT the more common 4-40). When you reinstall the nut, do not stake it, but lock it down with a brittle adhesive, finger nail polish work well.
Those hose clamps are the early style, they tend to be brittle, I suggest you replace those as well.
A word of caution, it was common for the LP seat to be staked to the brass nut, it appears this one has been. The stem is brass and easily broken. I remove the nozzle as an assembly, you have to reach under the lever and remove the 2 screws and support levers then you can unscrew the assembly. It's a pain to do but can be done. With it removed you can hold the lower part of the LP seat holder and GENTLY work the nut DOWN (ON) a turn or 2. Next try to clean up the top threads with a tiny file or knife blade and finally work the nut off and on until it comes off. Back in the day, if you broke that part, the reg was not repairable, VDH has replacements now or you can use the HPR. If you get it off and want to reuse it, I suggest cleaning up the threads with a 5-40 die (NOT the more common 4-40). When you reinstall the nut, do not stake it, but lock it down with a brittle adhesive, finger nail polish work well.
Those hose clamps are the early style, they tend to be brittle, I suggest you replace those as well.
