*PLUMBERSSTOCK EXPERT* responded:
Good day! Thank you for your interest in our Pfister 951-0090 outlet hose. If you are asking for the model or product number of this hose, it is 951-0090 (or "951-009"). This product is specially designed for Pfister's 526 Contempra pull-out kitchen faucets. Please see this Specification Sheet for reference. If you're asking if the serial number is needed to place an order, it is not. If you want to order, all you have to do is to click on Add to Cart, enter your zip code for shipping and follow the succeeding steps. If you have further inquiries, please don't hesitate to send us a message using the Contact Us tab found on the bottom right part of your screen. Happy shopping at PlumbersStock.com!