1. Support the shaft mounted impeller
2. It dampens the vibration and noise
3. It makes sealing b/w outlet and inlet and differential pressure too .
4. It wear itself to protect the impeller and casing .
1. Open up the purifier and place the blind disc at the bottom of disc stack. 2. The water outlet is blocked by seal on the gravity disc. 3. Blank off sealing water inlet line .
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