{"product_id":"sierra-18-4258-marine-pipe-plug-3-4-in-thread-replaces-mercruiser-22-33198a1-crusader-113186-mallory-9-41205","title":"Sierra 18-4258 Pipe Plug, 3\/4 Inch Thread, Steel, Replaces Mercruiser 22-33198A1","description":"\u003cp\u003eThe Sierra 18-4258 is a steel pipe plug with a 3\/4 inch thread, built to seal unused ports on marine exhaust manifolds and related engine components. It is designed for use with the Sierra 18-1949 manifold spacer and is a common replacement item for boat owners servicing exhaust manifold assemblies. The plug is machined from steel and finished in silver, matching the quality and dimensions of the original equipment part it replaces. Because it threads directly into standard 3\/4 inch NPT-style ports, it is a straightforward swap during manifold service, riser replacement, or general maintenance work where a factory pipe plug has corroded, stripped, or gone missing.\u003c\/p\u003e\u003cp\u003eSierra manufactures this plug to meet or exceed original equipment specifications, so fit, thread engagement, and sealing performance match what the factory part delivers. It is sold as a single item (one plug) and ships with the UPC 030999875709 for easy identification at checkout or in parts lookup systems.\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 18-4258\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 3\/4 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Silver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999875709\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Manifold Spacer:\u003c\/strong\u003e 18-1949\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eDesigned for use with the Sierra 18-1949 manifold spacer.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCrusader 113186\u003c\/li\u003e\n\u003cli\u003eGLM 21892\u003c\/li\u003e\n\u003cli\u003eMallory 9-41205\u003c\/li\u003e\n\u003cli\u003eMercruiser 22-33198A1\u003c\/li\u003e\n\u003cli\u003eMercruiser 22-41622\u003c\/li\u003e\n\u003cli\u003eMercruiser 22-46754\u003c\/li\u003e\n\u003cli\u003eMercruiser 22-33198\u003c\/li\u003e\n\u003cli\u003eOsco 1016012\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size does the Sierra 18-4258 pipe plug have?\u003c\/strong\u003e The Sierra 18-4258 pipe plug has a 3\/4 inch thread.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4258 a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-4258 is a genuine Sierra part, manufactured by Sierra to meet or exceed the original equipment specifications of the parts it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM numbers does the Sierra 18-4258 pipe plug cross-reference to?\u003c\/strong\u003e It is interchangeable with Crusader 113186, GLM 21892, Mallory 9-41205, Mercruiser 22-33198A1, 22-41622, 22-46754, and 22-33198, as well as Osco 1016012.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-4258 made of?\u003c\/strong\u003e Steel is the material used for the Sierra 18-4258 pipe plug, finished in silver.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4258 pipe plug weigh?\u003c\/strong\u003e The Sierra 18-4258 pipe plug weighs 0.1 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other part is the 18-4258 used with?\u003c\/strong\u003e The 18-4258 pipe plug is designed for use with the Sierra 18-1949 manifold spacer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many plugs come in one order of the 18-4258?\u003c\/strong\u003e One order of the Sierra 18-4258 includes a single pipe plug (quantity of 1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4258 replace a Mercruiser pipe plug?\u003c\/strong\u003e Yes, the Sierra 18-4258 replaces Mercruiser pipe plugs 22-33198A1, 22-41622, 22-46754, and 22-33198.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-4258 pipe plug?\u003c\/strong\u003e The UPC for the Sierra 18-4258 pipe plug is 030999875709.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the Sierra 18-4258 be used to replace a Mallory pipe plug?\u003c\/strong\u003e Yes, the Sierra 18-4258 is interchangeable with Mallory part number 9-41205.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988172910811,"sku":"SIE-18-4258","price":4.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4258_lg__81665.1661520596.500.750.jpg?v=1785188604","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-4258-marine-pipe-plug-3-4-in-thread-replaces-mercruiser-22-33198a1-crusader-113186-mallory-9-41205","provider":"Good Vibes Marina","version":"1.0","type":"link"}