the ER 5-2 (as well as all their 5" diameter series, including their renamed CS/RS80) uses the modded sedra 3500 pump (ER: sp2).
if you have an older ER 6-1 or 2 (1 was 20"=current RS100, 2 was 24" height=RS110 discontinued..) they both used the sp2 too, so should be exactly the same pump as your 5-2. for the 6-2 there was also the RS/CS 6-2+ which was the same body, but with the modded sedra 5000 pump (sp3). if you have a 24" height 6-2, then just by the replacement new sp3 from ER as you will get more out efficiency out of your skimmer.
i know they have new skimmer pumps, i think starting with the sp4 where you start getting into gen-x and eheim pumps.. but don't think for the sp2 and sp3's (sedra 3500/5000). an alternative would be to see if you can get an aquabee/red dragon (i think they were found to be made from same factory as laguna hagan pumps, just different impellers, i remember seeing a thread here on rc..)/one of those sicci pumps (from the bubble masters).. but for simple plug/play replacement the sp3 should do fine..
though you can always check the ER forum and website too..
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