I was going to say the military uses that type of J valve on all their doubles, I don’t know why though, we call them suicide manifolds up here. There’s a huge failure point in not only the in the yoke fitting, but also the fact that you can’t isolate, or breath each tank independently. In the event of an emergency these are a great way to lose a lot of air very quickly. I don’t know even know why the military still uses these, maybe someone can answer that. Anyways, since there in such great shape you might be able to sell them to a diving or military museum. But they’re really not worth much to recreational or technical divers.