[Marcus]

Originally Posted by ianr33

The diaphragm cover may be missing on some regs. More details here:
http://www.dirdirect.com/xtx%20diaphragm%20cover.pdf

If you take the front cover off it should be obvious if this part is present or not. Just be careful with the diaphragm.

Thanks. I did it and I have the silver cover in place. I decided not to mess with it in order not to disturb the diaphragm.