There's no a whole lot to the sub pumps but you probably could either take them down enough to take them in as "motors". The yard you deal with may take them whole as motors if you want to try the easy way out. And you probably would get more that way unless they are all stainless steel, where pulling off stainless bits might net a little more money. (that is, if stainless is priced better than motors...)
The other thing I could suggest is to check to see if your yard has any rules about taking motors filled with oil. If so, you might have to drill the housings and drain them.
Finally, take a few precautions when working on this stuff. After all, they have been literally swimming in shzt!! Dump them in a bucket of bleach or use rubber gloves and a facemask.
Hope this helps,
Jon.
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