Response to This chlorinator comes with an internal check valve and a clear lid. 2" unions are included with the chlorinator so if you have 2" pipe no reducers are needed. If you have 1.5" pipe then you will need to purchase two 1.5" x 2" reducer bushings, or if you have 2.5" pipe then you will need to purchase two  2.5" x 2" reducer bushings.

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