*PLUMBERSSTOCK EXPERT* responded:
Good day! Thank you for posting a question about the AY McDonald 20-215WDDD Water Meter Setter. We contacted AY McDonald and they informed us that you could use this part# 720-3D3ASY nut assembly. You can check this submittal sheet to view the information if you would like. While we do not have the 720-3D3ASY nut assembly on our website, we would still be able to order it for you directly from AY McDonald. Please contact one of our customer service representatives at 435-868-4020 between 8:00 AM and 7:00 PM MT or through e-mail at email@example.com. They'll be happy to assist you. Please don't hesitate to contact us if you have any further question about this product. We thank you for choosing PlumbersStock.com. Have a great day!