Rangemaster Restricted Outlet Port / Scale Build-up

Garbage disposal runs but water drains very slowly even though pipes are clear.

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Possible Causes

Limescale or hardened grease narrowing the Rangemaster outlet port, partially collapsed rubber outlet gasket, misaligned discharge elbow reducing bore

How to Fix / Troubleshooting

Safety first: Turn off power and place a bucket under the outlet.

  • Remove discharge elbow: Detach the elbow from the disposal outlet and inspect the outlet port for scale or grease build-up.
  • Clean outlet: Use a bottle brush and descaling solution suitable for metal/plastic to remove deposits. Rinse thoroughly.
  • Inspect gasket: Replace any deformed or swollen rubber outlet gasket that may be restricting flow.
  • Reassemble and test: Refit the elbow, ensuring correct alignment and full bore, then run water and operate the disposal to confirm improved drainage.
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Repair Difficulty

Easy 2/5

Required Part

Disposal outlet port and gasket
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