{"product_id":"mercury-big-block-ec-cat-retain-rings-866775","title":"Mercury Big Block EC Cat Retain Rings #866775","description":"\u003ch2\u003eMercury Marine 866775 Retainer\u003c\/h2\u003e\n\n\u003cp\u003eRetaining rings are small, precise, and easy to overlook on a parts list right up until you need one and do not have it. The Mercury Marine 866775 is a genuine OEM retaining ring set for Mercury Big Block EC Cat applications, providing the correct retention hardware for components within the EC Cat system on compatible Mercury big block engines.\u003c\/p\u003e\n\n\u003cp\u003eThe EC Cat system on Mercury big block engines is an emissions control technology that uses a catalytic converter integrated into the exhaust system to reduce exhaust emissions. The retaining rings within this system hold specific components securely in position, maintaining the correct alignment and sealing that the system depends on to function properly. When a retaining ring fails, becomes deformed, or goes missing during a service, the component it secures can shift, creating leaks, misalignment, or reduced system effectiveness that may not be immediately obvious but compounds over time.\u003c\/p\u003e\n\n\u003cp\u003eAs genuine Mercury Marine OEM parts, the 866775 retaining rings are manufactured to the exact dimensions, material specification, and retention force required for the EC Cat application on compatible big block engines. They are the correct rings for the job, not a generic snap ring that approximates the fit. For any service or rebuild involving the EC Cat system, having the right retaining rings on hand before starting the job keeps the repair moving without unnecessary delays.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGenuine Mercury Marine OEM retaining rings\u003c\/li\u003e\n  \u003cli\u003ePart Number: 866775\u003c\/li\u003e\n  \u003cli\u003eDesigned for Mercury Big Block EC Cat applications\u003c\/li\u003e\n  \u003cli\u003eOEM dimensions, material specification, and retention force\u003c\/li\u003e\n  \u003cli\u003eDirect replacement with no modification required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eConfirm your engine model and serial number before ordering. The EC Cat system was used on specific Mercury big block configurations, and verifying compatibility with your engine ensures these are the correct retaining rings for your application before the service begins.\u003c\/p\u003e\n\n\u003cp\u003e\u003cb\u003eNormalized SKU:\u003c\/b\u003e 866775\u003cbr\u003e\u003cb\u003eUPC Code:\u003c\/b\u003e 745061814950\u003c\/p\u003e","brand":"Mercury Marine","offers":[{"title":"Default Title","offer_id":54090304520497,"sku":"MRC-866775","price":29.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0015\/7184\/8291\/files\/mercury-big-block-ec-cat-retain-rings-866775-745061814950-1236626858.jpg?v=1777977090","url":"https:\/\/www.firstchoicemarine.com\/products\/mercury-big-block-ec-cat-retain-rings-866775","provider":"First Choice Marine","version":"1.0","type":"link"}