This Watkins 1019801-03 or 39577-03 Vendor Code 3536 2HP Impeller that fits 56 Frame Pump Wet Ends manufactured by Intertek LX Brand only. It is about 4 1/8"" across the face edge to edge, it measures about 3" from the tip of the front to the tip of the sleeve in the back, it also measures 7/16" from the inside of the vane edge to edge. Some of these impellers have a number on them B351-21 if yours does you must measure the overall width of the impeller to get the correct one.
NOTE: This Wet End looks a lot like an Aqua-Flo and a CMP Wet End but they do not interchange see the video for how to tell the difference!
