Pentair Drain Plug Seal Leak

Pump runs but water leaks from the drain plugs at the bottom of the Pentair pump housing.

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Possible Causes

Loose drain plugs, Missing or damaged drain plug O‑rings, Cross‑threaded plugs, Freeze damage to threads

How to Fix / Troubleshooting

Safety first: Turn off pump and relieve pressure before removing drain plugs.

  • Step 1 – Tighten plugs: Hand‑tighten the drain plugs. Do not overtighten, as this can crack the housing.
  • Step 2 – Inspect O‑rings: Remove the plugs and inspect the small O‑rings. Replace any that are cracked, flattened, or missing.
  • Step 3 – Use thread sealant if needed: Apply a small amount of Teflon tape or thread sealant compatible with plastics if threads are slightly worn (avoid overuse).
  • Step 4 – Replace housing if cracked: If the pump housing threads are cracked from freeze damage, the entire housing may need replacement.
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Repair Difficulty

Easy 2/5

Required Part

Pump Drain Plug O-Rings
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