*PLUMBERSSTOCK EXPERT* responded:
Hi, there! We would be happy to help, but first, we need to know the model of the Pfister faucet that you're using in order for us to determine the proper installation procedures. You can also refer to this video on how to install faucet cartridges by Pfister. If you plan to purchase this product, please don't hesitate to click Add to Cart, enter your zip code and you're good to go. If you require more information, you can contact us @ 435-868-4020 or E-mail us @ support.plumbersstock.com. Thank you and have a great day!