The most typical boat transoms can accommodate this brass threaded drain stopper. They won't spin or move while on the boat because to the large base of this. The antifouling paint on these plugs is ABS or Black Bottomkote NT, which utilizes dual resin technology and offers the benefits of both ablative and hard paints. Each order comes with a typical two-pack of these drain plugs. WARNING: CA PROPOSITION 65 Cross References: OMC 0911831 Fit the following: OMC 2.3 1987 - 1989 2.5 1986 3 1986 - 1989 4.3 1986 - 1989 5 1986 - 1989 5.7 1986 - 1989 5.8 1989 7.4 1988 7.5 1987 - 1989 Key features: N.T. Black Bottomkote Dual Resin Technology antifouling paint offers benefits of both ablative and hard paints. Fit the majority of engines with side water inlets and is simple to install without the need for tools. For the majority of common boat transoms and hulls, 2-Pack standard size brass threaded drain plug Specifications: SKU: 911831 UPC: 745419148591 Weight: 0.01 LBS Manufacturer Part Number (MPN): 911831