*PLUMBERSSTOCK EXPERT* responded:
Hi there! Thanks for posting you question about the Moen 137034PM Slider. No, it won't. This slider is made for Moen slide bars that are about an inch in diameter so a 3-inch slide bar will not fit. Hope this helps. For more information, please don't hesitate to contact us if you have any further question or concern about this product. We thank you for choosing PlumbersStock.com. We are always happy to serve you!