I am looking at replacing my old 0-177897-22 2 Hp pump. I get 2 matches B855 & B2843. What is the difference between them
The correct replacement for your 0-177897-22 is part number B855. The B855 motor is an uprated 2HP model.
The B2843 is a full rated 2HP motor. That means it would be a stronger motor than what you currently own.