SMC EX600

I have a whole stack of these SMC EX600 modules. I bought these from a battery manufacturer that went out of business. I am not sure if they work or not or how to use them. Manifolds from 2 to 9 station. Let me know what you need. Parts are located in Simi Valley, CA 93063. I would like $50 each plus shipping. Let me know if you have any questions or suggestions. Thanks,

Matt