What the difference between these two valves and can they be used for home brewing?
$25 - http://cgi.ebay.com/NEW-JOMAR-1-2-SS-3-PIECE-BALL-VALVE-S-SS-1000N-4B_W0QQitemZ280473316114QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item414d832b12
$15 - http://cgi.ebay.com/NEW-JOMAR-1-2-CS-3-PIECE-BALL-VALVE-S-CS-1000N-SS-4B_W0QQitemZ280470906126QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item414d5e650e
$25 - http://cgi.ebay.com/NEW-JOMAR-1-2-SS-3-PIECE-BALL-VALVE-S-SS-1000N-4B_W0QQitemZ280473316114QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item414d832b12
$15 - http://cgi.ebay.com/NEW-JOMAR-1-2-CS-3-PIECE-BALL-VALVE-S-CS-1000N-SS-4B_W0QQitemZ280470906126QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item414d5e650e