![What is this bolt for? Priming the pump? Submersible sump pump hums when plugged in but isn't moving water. The online manual doesn't mention priming or oil maintenance. Every online source says What is this bolt for? Priming the pump? Submersible sump pump hums when plugged in but isn't moving water. The online manual doesn't mention priming or oil maintenance. Every online source says](https://preview.redd.it/t2zt520q2dl71.jpg?auto=webp&s=004b54a491e941211b59924d36dcbd47380869e5)
What is this bolt for? Priming the pump? Submersible sump pump hums when plugged in but isn't moving water. The online manual doesn't mention priming or oil maintenance. Every online source says
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