{"product_id":"sierra-18-2533-transom-seal-for-omc-sterndrive-cobra-stern-drive-replaces-omc-911797","title":"Sierra 18-2533 Transom Seal for OMC Sterndrive and Cobra Stern Drive, Replaces 911797","description":"\u003cp\u003eThe Sierra 18-2533 Transom Seal is a round transom seal engineered for OMC Sterndrive and Cobra Stern Drive applications. It seals the transom opening where the drive unit passes through the boat's hull, forming a critical barrier against water intrusion into the bilge. Each package contains one transom seal, sized and molded to seat directly in place of the original equipment seal it replaces.\u003c\/p\u003e\u003cp\u003eSierra builds this seal to meet or exceed the specification of the original OMC part, giving boat owners a direct-fit replacement without modification. It is commonly needed when the factory transom seal has hardened, cracked, or begun to leak with age, a routine maintenance item for stern drive boats. The 18-2533 is backed by a limited warranty and is cross-referenced to OMC part number 911797, making it easy to identify as the correct replacement for that original component.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-2533\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Transom Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e OMC Sterndrive, Cobra Stern Drive\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1 transom seal per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.13 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999312280\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999312280\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for OMC Sterndrive and Cobra Stern Drive units.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 911797\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2533 transom seal fit?\u003c\/strong\u003e The Sierra 18-2533 is designed for OMC Sterndrive and Cobra Stern Drive applications, sealing the transom opening where the drive unit passes through the hull.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2533 the same as OMC part 911797?\u003c\/strong\u003e Yes, the 18-2533 transom seal is the direct cross-reference replacement for OMC 911797.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a package of the 18-2533?\u003c\/strong\u003e One transom seal is included per package of the Sierra 18-2533.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2533 transom seal weigh?\u003c\/strong\u003e The Sierra 18-2533 transom seal weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the 18-2533 transom seal?\u003c\/strong\u003e It is a round transom seal, matching the shape of the OMC 911797 seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2533 a genuine OEM part or an aftermarket equivalent?\u003c\/strong\u003e The 18-2533 is a Sierra-manufactured replacement part built to meet or exceed the original equipment part it replaces, not an OEM-branded component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2533 come with a warranty?\u003c\/strong\u003e Yes, the Sierra 18-2533 transom seal is covered by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-2533 different from Sierra's 18-2767 and 18-2768 transom seals?\u003c\/strong\u003e The 18-2533 is a distinct transom seal for OMC Sterndrive and Cobra Stern Drive units, while the 16-hole 18-2767 replaces OMC 313080 for 120 HP and up applications from 1967-77, and the 22-hole 18-2768 replaces OMC 909527 for all applications from 1978-86 -- these are separate parts for different fitments, so match the part number to your drive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a transom seal like the 18-2533 do?\u003c\/strong\u003e A transom seal such as the Sierra 18-2533 seals the opening in the boat's transom where the stern drive unit passes through, preventing water from entering the bilge.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-2533 transom seal?\u003c\/strong\u003e The Sierra 18-2533 transom seal carries UPC 030999312280.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988106916059,"sku":"SIE-18-2533","price":12.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2533_lg__14609.1558122332.500.750.jpg?v=1785188494","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2533-transom-seal-for-omc-sterndrive-cobra-stern-drive-replaces-omc-911797","provider":"Good Vibes Marina","version":"1.0","type":"link"}