{"product_id":"lns-riser-block-off-gasket-47-04761","title":"SIERRA 18-04761 Riser Block Off Gasket | Marine Exhaust Seal","description":"\u003cp data-start=\"275\" data-end=\"617\"\u003eThe \u003cstrong data-start=\"279\" data-end=\"327\"\u003eSIERRA Riser Block Off Gasket -\u003c\/strong\u003e is designed to provide a dependable seal when an exhaust riser is removed, blocked off, or temporarily taken out of service. It helps protect marine engines from water intrusion, exhaust leaks, debris entry, and corrosion during winterization, rebuilds, riser replacement, or service work.\u003c\/p\u003e\n\u003cp data-start=\"619\" data-end=\"781\"\u003ePrecision-cut for proper riser port sealing, this gasket is made from durable marine-grade compressed gasket material suitable for demanding exhaust environments.\u003c\/p\u003e\n\u003ch2 data-start=\"783\" data-end=\"798\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"799\" data-end=\"1110\"\u003e\n\u003cli data-start=\"799\" data-end=\"837\"\u003ePrecision-cut riser block off gasket\u003c\/li\u003e\n\u003cli data-start=\"838\" data-end=\"885\"\u003eHelps prevent water ingestion into the engine\u003c\/li\u003e\n\u003cli data-start=\"886\" data-end=\"921\"\u003eReduces risk of exhaust gas leaks\u003c\/li\u003e\n\u003cli data-start=\"922\" data-end=\"980\"\u003eUseful during winterization, rebuilds, and riser service\u003c\/li\u003e\n\u003cli data-start=\"981\" data-end=\"1026\"\u003eMarine-grade compressed gasket construction\u003c\/li\u003e\n\u003cli data-start=\"1027\" data-end=\"1085\"\u003eDesigned for inboard and sterndrive exhaust applications\u003c\/li\u003e\n\u003cli data-start=\"1086\" data-end=\"1110\"\u003eNew replacement gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"1112\" data-end=\"1129\"\u003eSpecifications\u003c\/h2\u003e\n\u003cul data-start=\"1130\" data-end=\"1351\"\u003e\n\u003cli data-start=\"1130\" data-end=\"1151\"\u003e\n\u003cstrong data-start=\"1132\" data-end=\"1140\"\u003eSKU:\u003c\/strong\u003e 47-04761\u003c\/li\u003e\n\u003cli data-start=\"1152\" data-end=\"1173\"\u003e\n\u003cstrong data-start=\"1154\" data-end=\"1164\"\u003eBrand:\u003c\/strong\u003e SIERRA\u003c\/li\u003e\n\u003cli data-start=\"1174\" data-end=\"1210\"\u003e\n\u003cstrong data-start=\"1176\" data-end=\"1185\"\u003eType:\u003c\/strong\u003e Riser Block Off Gasket\u003c\/li\u003e\n\u003cli data-start=\"1211\" data-end=\"1268\"\u003e\n\u003cstrong data-start=\"1213\" data-end=\"1226\"\u003eMaterial:\u003c\/strong\u003e Marine-grade compressed gasket material\u003c\/li\u003e\n\u003cli data-start=\"1269\" data-end=\"1291\"\u003e\n\u003cstrong data-start=\"1271\" data-end=\"1285\"\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli data-start=\"1292\" data-end=\"1351\"\u003e\n\u003cstrong data-start=\"1294\" data-end=\"1310\"\u003eApplication:\u003c\/strong\u003e Marine exhaust riser block-off sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"1353\" data-end=\"1379\"\u003eCompatibility \u0026amp; Fitment\u003c\/h2\u003e\n\u003cp data-start=\"1380\" data-end=\"1630\"\u003eDesigned for compatible marine inboard and sterndrive exhaust riser applications using \u003cstrong data-start=\"1467\" data-end=\"1490\"\u003eSIERRA 18-04761\u003c\/strong\u003e. Always verify fitment by comparing your existing gasket, riser port shape, engine model, and manufacturer part number before installation.\u003c\/p\u003e\n\u003ch2 data-start=\"1632\" data-end=\"1653\"\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp data-start=\"1654\" data-end=\"1913\"\u003eClean and inspect all mating surfaces before installation. Check for corrosion, warping, pitting, or old gasket residue. Install using manufacturer-recommended torque specifications. Replace the gasket each time the riser is removed to ensure a reliable seal.\u003c\/p\u003e\n\u003ch2 data-start=\"1915\" data-end=\"1934\"\u003eMaintenance Tips\u003c\/h2\u003e\n\u003cp data-start=\"1935\" data-end=\"2140\"\u003eInspect riser and manifold sealing surfaces during seasonal service. Replace worn, crushed, or heat-damaged gaskets immediately. Keep spare gaskets on hand for winterization and exhaust system maintenance.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":43563827593252,"sku":"47-04761","price":11.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-04761_500x500_7db11614-e29a-45e5-bc09-fc8c84920dc7.jpg?v=1779516918","url":"https:\/\/marisolmarine.com\/products\/lns-riser-block-off-gasket-47-04761","provider":"Marisol Marine Company","version":"1.0","type":"link"}