*PLUMBERSSTOCK EXPERT* responded:
Good day! Thank you for asking assistance from the PlumbersStock team! We're glad to know of your interest in our Watts FS-744-22 sanitary floor sink. The size of the no hub for this product is 4 inches. It is actually available in three sizes depending on the model that you want to purchase. If you would want the 2-inch and 3-inch no hub sizes, we have the FS-742-22 and the FS-743-22 units. For additional information about this floor sink, please refer to the specification sheet. Hope that this helps. If you're ready to place an order, simply click on Add to Cart and enter your information in the required fields. Enjoy shopping at PlumbersStock.com!