WOW... that is a deal brother! These retail for between 160 and 250 bucks each!
The Tech Data for anyone interested in reading about it: (PDF)
http://www.mrostop.com/media/catalog/product/firestone_pdfs/W01-358-6947.pdf AIR INLET
1/4" NPT is standard. 3/4" NPT is also available for most
parts. (See the data sheet order block on each specific
part).
BLIND NUT
3/8-16 UNC thread x 5/8" deep (two or four per each plate
depending on part size). Used for mounting the part.
UPPER BEAD PLATE
(9 gauge carbon steel, .149"). Permanently crimped to
bellows to form an airtight assembly which allows for leak
testing before the unit leaves the factory. Zinc/chromate
plated for rust protection.
GIRDLE HOOP
Wire wound type shown, molded into the bellows.
BELLOWS
Wall gauge is approximately 1/4". See page 5 for detailed
information.
