{"product_id":"manifold-drain-plug-kit-fits-volvo-penta-gm-v6-v8-4-3-5-0-5-7-7-4-8-2-replaces-479956-glm13982-192154","title":"Manifold Drain Plug Kit – Fits Volvo Penta GM V6 V8 4.3 5.0 5.7 7.4 8.2 (Replaces 479956, GLM13982, 192154)","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eManifold Drain Plug Kit\u003c\/strong\u003e is engineered for Volvo Penta GM-based V6 and V8 marine engines, including 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L models. The kit features quick-drain plastic cocks located on the rear (propeller side) of the exhaust manifold for efficient winterization and maintenance.\u003c\/p\u003e\n\u003cp\u003eDirect aftermarket replacement for OEM part numbers 479956, GLM13982, and 192154, ensuring compatibility with Volvo Penta and select OMC applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eQuick-drain design with plastic handle for tool-free operation\u003c\/li\u003e\n  \u003cli\u003eMetric thread specifications: 20.50mm × 1.75 outer, 2.5mm × 10.70mm handle diameter\u003c\/li\u003e\n  \u003cli\u003eComplete kit includes two drain plugs for dual-manifold installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e479956\u003c\/td\u003e\n        \u003ctd\u003ePrimary OEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003eGLM13982\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGeneric\u003c\/td\u003e\n        \u003ctd\u003e192154\u003c\/td\u003e\n        \u003ctd\u003eInterchange number\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003eGM V6 (4.3L)\u003c\/td\u003e\n        \u003ctd\u003e479956\u003c\/td\u003e\n        \u003ctd\u003eGM-based engines\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003eGM V8 (5.0L, 5.7L, 7.4L, 8.2L)\u003c\/td\u003e\n        \u003ctd\u003e479956\u003c\/td\u003e\n        \u003ctd\u003eGM-based engines\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC\u003c\/td\u003e\n        \u003ctd\u003e4.3L \u0026amp; 5.7L\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003eGM-based only\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eOuter Thread\u003c\/dt\u003e\n  \u003cdd\u003e20.50mm × 1.75 metric\u003c\/dd\u003e\n  \u003cdt\u003eHandle Thread\u003c\/dt\u003e\n  \u003cdd\u003e2.5 metric\u003c\/dd\u003e\n  \u003cdt\u003eHandle Diameter\u003c\/dt\u003e\n  \u003cdd\u003e10.70mm\u003c\/dd\u003e\n  \u003cdt\u003eValve Type\u003c\/dt\u003e\n  \u003cdd\u003eQuick-drain plastic cock\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n  \u003cdd\u003eMarine-grade plastic with brass insert\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Location\u003c\/dt\u003e\n  \u003cdd\u003eRear side of exhaust manifold (propeller side)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003e2 × Exhaust Manifold Drain Plug Kit\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure engine is cool and depressurized before beginning work.\u003c\/li\u003e\n  \u003cli\u003eLocate the existing drain plugs on the rear (propeller side) of each exhaust manifold.\u003c\/li\u003e\n  \u003cli\u003eRemove old drain plugs by unscrewing counterclockwise; have a container ready to catch residual coolant.\u003c\/li\u003e\n  \u003cli\u003eClean the threads in the manifold port thoroughly to remove debris or corrosion.\u003c\/li\u003e\n  \u003cli\u003eHand-thread the new drain plug clockwise until snug; avoid cross-threading.\u003c\/li\u003e\n  \u003cli\u003eTighten securely but do not over-torque the plastic components.\u003c\/li\u003e\n  \u003cli\u003eEnsure the drain cock is in the closed position before refilling the cooling system.\u003c\/li\u003e\n  \u003cli\u003eRefill coolant to manufacturer specifications and bleed air from the system.\u003c\/li\u003e\n  \u003cli\u003eStart the engine and check for leaks around both drain plugs.\u003c\/li\u003e\n  \u003cli\u003eFor winterization, open both cocks fully to drain coolant completely.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this fit my Volvo Penta engine?\u003c\/summary\u003e\n  \u003cp\u003eThis kit is designed for GM-based V6 and V8 Volvo Penta engines (4.3L, 5.0L, 5.7L, 7.4L, 8.2L). It also fits select OMC 4.3L and 5.7L GM-based models. Verify your existing drain plug has 20.50mm × 1.75 metric threads before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I use the quick-drain feature?\u003c\/summary\u003e\n  \u003cp\u003eRotate the plastic handle 90 degrees to open the valve and drain coolant. Close it completely before refilling. The tool-free design simplifies winterization and seasonal maintenance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I reuse the old drain plugs?\u003c\/summary\u003e\n  \u003cp\u003eDrain plugs should be replaced if cracked, stripped, or leaking. Plastic components degrade over time from heat cycling and coolant exposure, so replacement every few seasons is recommended.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat's the difference between this and the OEM part?\u003c\/summary\u003e\n  \u003cp\u003eThis is an aftermarket replacement built to OEM specifications with comparable materials and thread dimensions. Manufactured in an ISO 9002 facility and batch-inspected for dimensional accuracy and valve operation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhy do I need two drain plugs?\u003c\/summary\u003e\n  \u003cp\u003eV6 and V8 engines have two exhaust manifolds, each requiring its own drain plug for complete coolant drainage during winterization or service.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should I replace these plugs?\u003c\/summary\u003e\n  \u003cp\u003eInspect annually for cracks, hard plastic, or difficult operation. Replace every 3–5 years or immediately if leaking or stripped.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":51025814651195,"sku":"24PK144","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/12_8dd1fa5e-f5f1-4fa9-ad84-64d4d3d6828b.png?v=1772959624","url":"https:\/\/seasierra.com\/products\/manifold-drain-plug-kit-fits-volvo-penta-gm-v6-v8-4-3-5-0-5-7-7-4-8-2-replaces-479956-glm13982-192154","provider":"SeaSierra","version":"1.0","type":"link"}