The Dunn-Rite Poola Hoop Stainless Rim (18 inch, part RIM750) is the marine-grade stainless steel replacement rim for the Dunn-Rite Poola Hoop pool basketball system. The 18 inch opening is the Poola Hoop's signature feature, a larger than standard rim that makes scoring easier for younger players. Stainless steel for corrosion resistance in pool and salt-system environments. Will this fit your hoop? Please read this first. This rim fits the Dunn-Rite Poola Hoop. Dunn-Rite rims are not interchangeable across the whole product line. The bolt pattern is matched to the backboard, so a rim from another model will not line up. This is not the 13.5 inch rim. If you have a PoolSport or an H2O Hoop, you need the PoolSport / H2O Hoop Stainless 13.5 inch rim (RIM555). Not sure which unit you have? Ask us before you order. Send a photo of the whole hoop assembly to dan@aquamentor.com or call (908) 889-4242 and we will identify it for you. Specifications Rim diameter: 18" (oversized for easier scoring) Dunn-Rite part number: RIM750 Material: marine-grade stainless steel Compatible system: Dunn-Rite Poola Hoop Matching backboard: Poola Hoop Backboard (BB450-2PH)