*PLUMBERSSTOCK EXPERT* responded:
Good day! We are happy to know about your interest in our Delta RP71254OB Single Metal Lever Handle Kit. This handle does not fit on a round stem nor a diamond stem. According to Delta, this Delta RP71254OB fits on the Brizo RP50265 Valve Cartridge, which has a square stem. It is preferred that this handle be installed on the Delta 15984LF-OB Porter One-Handle Lavatory Faucet. For more details, please check this Specification Sheet. If you want to order a product, go to its product's page, just click "Add to Cart" and put your postal code and you're ready to go. The Delta 15984LF-OB not yet posted on our website but uploading of information is ongoing. Just have the product number ready and call one of our customer support specialists at 435-868-4020 or send a message by pressing the "Contact Us" tab found on the bottom right part of your screen. If you have other questions you may also contact them. Thank you for visiting PlumbersStock.com!