I have a U.S. Divers conshelf 21 regulator and matching octo. If anyone is interested in it send me a message. It was washed after every dive, and hasn't been used in over a year. It should be serviced before use. It worked fine the last time it was used, but after sitting that long it should be checked out. If anyone is interested I can send or post some pictures. Asking $75 OBO shipped. Thanks