Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
Originally posted by bwollard
Funny you should ask that question. I am having the same problem with my TX100 2nd stage. My ATX50 octo has the s/n on the bottom edge of the housing. My TX100 1st stage has the s/n on the outside of the valve body. I am beginning to think that the s/n is the same for the 1st and 2nd stages since they come together as a unit called TX100. Can anyone else confirm this?