U109-372SS is for Dura Glas II(before 1998), and Max E Glas II(before 1998)Pumps.
The seal can be damaged by improper PH or other water chemistry, which will cause leakage between the pump and the motor. The leakage will damage the motor.
Seal replacement instructions are included.
Seal is constructed by SSC to Sta Rite's specifications.
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