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In the rotor type of oil pump, close tolerance is required for good pumping continuality. Yes, Richard that's the bypass port plug - you'll see it identified on some Beckett Cleancut Oil Pump instructions such as this excerpt from the, BECKETT CLEANCUT PUMP INSTRUCTIONS 5285-001 Service & Installation [PDF] (2020) www.beckettcorp.com, Heating Division West Molesey //-->,