*PLUMBERSSTOCK EXPERT* responded:
Hi, there! Thank you for posting your inquiry on the AY Mcdonald 6164-002 product page. Based on the information that you provided, are you referring to the MTH D71 Series of Pumps? Just to be sure, please take a look at this Image and specification sheet as basis for comparison. PlumbersStock needs to be sure so that we may be able to provide you with the correct part that you need. If it is indeed your pump, please refer to page 3 from the provided specification sheet to view the parts that you need. As what we can tell based on the specification sheet, your pump has a 143-215JM frame size mechanical seal. There are 3 choices of seals available, each with their own O-ring material type. The S-103 uses the Buna-N, the S-104 uses EPT, while the S-105 uses Viton. If you're sure and are already decided on what mechanical seal you need, don't hesitate to call our customer service representatives @ 435-868-4020 between 8:00 am and 7:00 pm MST or through e-mail at; email@example.com to place an order. Thank you and we hope to see you again here at PlumbersStock.com!