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Part # 5053-100
Pentair Pool Products
Manufacturer Code 17351-0101S
Alternate Part #'s 173510101S
This is the comparable replacement seal to the Seal, Shaft (37400-0027s) that is has been discontinued.
How do I change the shaft seal on my pool pump?
Changing the shaft seal is quite simple. Here's How To Replace a Pool Motor Shaft Seal.