My J-valves should all be usable. I have 5 steel 72’s waiting to be hydrod. I may have found a place that will plus stamp them. I’ll be servicing the valves but since I never use the reserve switch on the one valve I often use, I figured if there was a plug, i’d use them but keep the reserve to replace possibly someday. If anyone wants to pay $60+shipping so I can get a new pro valve from my lds, i’d be happy to part with a couple of them. They are standard 3/4”x14 threads and other than being old and in need of a good cleaning, I expect they will be quite usable. The one has an odd burst disk, looks like instead of an external nut head it is just a screw (the threaded part) screwed in with a hole in the middle of the screwdriver slot.