On Wed, 12 Jun 2013 06:00:46 +0000, Danny D wrote:

2. Cross reference to the Aladdin o-dash size:
http://www.aladdin1950.com/search.cfm
$9.22 Aladdin 1-O-240 Seal Plate Housing O-Ring

This also has an "Aladdin" cross reference table:
http://www.aqua-man.com/techdisplay.asp?Ic=T102