{"product_id":"ghmarine-exhaust-tube-bellows-for-mercruiser-alpha-bravo-78458a1-direct-fit-stainless-clamp-corrosion-resistant","title":"GHmarine exhaust tube bellows for Mercruiser Alpha \u0026 Bravo (78458A1) — direct-fit, stainless clamp, corrosion-resistant","description":"\u003cp\u003e\u003cstrong\u003eGHmarine 78458A1 exhaust tube bellows is a direct-fit replacement for Mercruiser Alpha and Bravo stern drives, offering flexible, durable exhaust routing with a stainless clamp included.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen your Mercruiser stern drive exhaust tubing needs a reliable connector that resists vibration and saltwater wear, this GHmarine bellows replaces the original 78458A1 and fits multiple Alpha, Bravo and related drive serial ranges. It’s molded from resilient material to handle the flexing and thermal changes found between the engine and outdrive while restoring a tight, watertight exhaust path.\u003c\/p\u003e\n\n\u003ch3\u003eWhich engines and drive models will this bellows fit?\u003c\/h3\u003e\n\u003cp\u003eThis bellows is designed to match the Mercruiser 78458A1 specifications and fits a range of Alpha and Bravo series stern drives across several production years. Always verify your drive’s serial number against the supported ranges before ordering to ensure correct compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eR\/MR\/Alpha One: serial no. 6225577 \u0026amp; up (1983–1990)\u003c\/li\u003e\n  \u003cli\u003eBravo I, II, III: serial no. OB664190 \u0026amp; up (1988 and later)\u003c\/li\u003e\n  \u003cli\u003eBlackhawk: serial no. 0F18677 \u0026amp; up (1994–1995)\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for original Mercruiser part 78458A1\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this bellows hold up in marine conditions?\u003c\/h3\u003e\n\u003cp\u003eThe GHmarine bellows uses a corrosion-resistant construction and flex-tolerant elastomer to withstand repeated cycles of motion, saltwater spray and temperature shifts. It is built to resist cracking and maintain a seal where rigid piping or worn connectors would fail.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMolded elastomer resists fatigue and saltwater degradation\u003c\/li\u003e\n  \u003cli\u003eFlexible ribs absorb vibration and engine movement\u003c\/li\u003e\n  \u003cli\u003eIncludes a stainless steel hose clamp to prevent leaks\u003c\/li\u003e\n  \u003cli\u003eReplaceable design matches OEM fit and mounting points\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat do I need to check before installing this replacement bellows?\u003c\/h3\u003e\n\u003cp\u003eBefore installing, inspect the outdrive and exhaust tube for corrosion, check serial numbers for compatibility, and confirm you have basic tools for clamp removal and tightening. Proper surface prep and torque on the clamp help ensure a leak-free seal and long-life performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify drive serial number against supported ranges\u003c\/li\u003e\n  \u003cli\u003eInspect mating tube for corrosion or scoring\u003c\/li\u003e\n  \u003cli\u003eHave pliers and a screwdriver or socket for clamp installation\u003c\/li\u003e\n  \u003cli\u003eApply anti-seize or marine lubricant if recommended for metal parts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill installation restore original performance and prevent leaks?\u003c\/h3\u003e\n\u003cp\u003eReplacing a worn or cracked bellows with this GHmarine unit restores the intended exhaust routing and reduces backflow and noise caused by leaks. While it addresses the flexible exhaust joint, inspect related fittings and the exhaust tube for comprehensive leak control.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplaces failed bellows to stop exhaust leaks and fumes\u003c\/li\u003e\n  \u003cli\u003eReduces vibration-related exhaust noise\u003c\/li\u003e\n  \u003cli\u003eRestores proper alignment between engine and outdrive exhaust\u003c\/li\u003e\n  \u003cli\u003eComes with stainless clamp for immediate installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Boaters, mechanics and marine service professionals who maintain Mercruiser Alpha- and Bravo-series stern drives and need a dependable replacement bellows. This part is aimed at owners restoring OEM-style exhaust connectors on inboard\/outboard drives from the listed serial ranges, and anyone who prefers a ready-to-install replacement that includes a corrosion-resistant clamp.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this bellows replace Mercruiser part 78458A1?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. GHmarine 78458A1 is a direct replacement for Mercruiser 78458A1 and matches the OEM fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is a clamp included with the bellows?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The product ships with a stainless steel hose clamp for secure installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GHmarine","offers":[{"title":"Default Title","offer_id":59350316155228,"sku":"B07M5YPL42","price":38.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1059\/5604\/9244\/files\/ghmarine-exhaust-bellows-front-view.jpg?v=1791115102","url":"https:\/\/sportium.co.uk\/products\/ghmarine-exhaust-tube-bellows-for-mercruiser-alpha-bravo-78458a1-direct-fit-stainless-clamp-corrosion-resistant","provider":"Sportium Sports And Outdoors","version":"1.0","type":"link"}