Chris, keep in mind the maintenance intervals. Haggle on the price if one of the big maintenance intervals are coming up, some could cost over 1K to have everything done right if you don't work on them yourself. Some PD motors had cam/lifter wear issues where the ALH's didn't. 192K and counting on mine.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).