One-Size fits all U.S. made 30 to 60 minute rated self-contained breathing apparatus. This item requires assembly in the field. All hardware is included and assembly should require a few minutes time with a Torx T-30 driver and 7/16" wrench.
This seems to answer your question, the key to the answer is "U.S." made.
Answered on 1/17/2014 by Bg