FORUM RULES UPDATED - The forum rules have been updated to continue to provide a friendly and safe environment for our member community. Please take a moment to review the updated rules and our terms of use and privacy policy. Click here for Forum Rules which has links to the 'terms of use' and 'privacy policy'.
My current switch box part number is339-7452A8. I am finding part numbers that will replace for instance, 339-7452A7 and 339-7452A9 but will skip the A8 number. So what do the A numbers signify?
