Most of the main drain and skimmer equalizer covers that were installed to comply with the Virginia Graeme Baker Pool and Spa Safety Act, were installed in April/May of 2009, and will need replacement in the spring of 2014.
Drain cover manufacturers were required to state a life span for each cover; with the majority of covers having a maximum life of 5 years, most covers will be due for replacement in 2014.
While a massive recall in 2011 meant many covers were replaced, some only needed an alteration, such as adding a spacer ring to provide added height and distance from the sump. Those may be up for replacement as well.