CPDiver:OK Rick, since I have already admitted to being enough of a dumbarse to dunk the reg minus the dustcap, I'll ask this question publicly.
Sintered Filter? Is that the opening that should have been covered by the dust cap?
Thanks
If you look into the opening thingie where the air goes into the first stage, you will see a funny looking filter there. It kind of looks like a stack of toothpicks on end. That is the sintered filter. Its job is to keep contaminants from entering the first stage. I doubt you did any harm to your reg, just make sure you leave the cap off for a while, and keep it in a dry clean place to be sure all the moisture is out. Just make a habit to peek at the filter before you use it to see if any green corrosion forms in it. If it does, just have it servised. No big deal.