{"product_id":"479956-manifold-drain-plug-kit-for-volvo-penta-gm-jlm-marine","title":"479956 Manifold Drain Plug Kit for Volvo Penta GM | JLM Marine","description":"\u003ch2\u003eManifold Drain Plug Kit – Fits Volvo Penta GM V6 and V8 Engines\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003eManifold Drain Plug Kit\u003c\/strong\u003e is designed for Volvo Penta GM-based V6 and V8 marine engines, including popular models such as 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L. Located on the rear (propeller side) of the manifold, this quick-drain plastic cock simplifies winterization and routine maintenance, making it an essential replacement part for proper engine care.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect Replacement for OEM Part Number:\u003c\/strong\u003e Volvo Penta 479956, GLM 13982, Sierra 18-4227, and others. This aftermarket kit delivers reliable performance and fit for Volvo Penta and OMC applications.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Metric Threading:\u003c\/strong\u003e Outer dimension 20.50mm × 1.75 metric thread; plastic handle 10.70mm diameter with 2.5 metric thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes 2 exhaust manifold drain plug assemblies with all components shown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick-Drain Design:\u003c\/strong\u003e Plastic cock design allows for fast, tool-free draining during winterization or service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\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\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e13982\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-4227\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-72154\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e192154\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\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-based V6 engines (4.3L)\u003c\/td\u003e\n\u003ctd\u003eRear manifold drain location\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003eGM-based V8 engines (5.0L, 5.7L, 7.4L, 8.2L)\u003c\/td\u003e\n\u003ctd\u003eRear manifold drain location\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e4.3L GM-based\u003c\/td\u003e\n\u003ctd\u003eGM engines only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e5.7L GM-based\u003c\/td\u003e\n\u003ctd\u003eGM engines only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Number\u003c\/td\u003e\n\u003ctd\u003e479956\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Thread Size\u003c\/td\u003e\n\u003ctd\u003e20.50mm × 1.75 metric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlastic Handle Thread\u003c\/td\u003e\n\u003ctd\u003e2.5 metric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlastic Handle Diameter\u003c\/td\u003e\n\u003ctd\u003e10.70mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHigh-quality marine-grade components\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Location\u003c\/td\u003e\n\u003ctd\u003eRear side (propeller side) of manifold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign Type\u003c\/td\u003e\n\u003ctd\u003eQuick-drain plastic cock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis kit includes:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e2 × Exhaust Manifold Drain Plug Assemblies (complete kits)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eAll components shown in the product images\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eEnsure the engine is completely cool and turned off 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\u003eIf replacing old plugs, carefully unscrew the existing drain plug assembly by turning counterclockwise.\u003c\/li\u003e\n\u003cli\u003eClean the manifold drain port threads thoroughly, removing any debris, corrosion, or old sealant.\u003c\/li\u003e\n\u003cli\u003eApply marine-grade thread sealant to the threads of the new drain plug (20.50mm × 1.75 metric thread).\u003c\/li\u003e\n\u003cli\u003eHand-thread the new drain plug into the manifold port, turning clockwise until finger-tight.\u003c\/li\u003e\n\u003cli\u003eTighten the plug securely using an appropriate wrench—do not over-torque to avoid stripping threads.\u003c\/li\u003e\n\u003cli\u003eEnsure the plastic drain cock handle is in the closed position (perpendicular to the manifold).\u003c\/li\u003e\n\u003cli\u003eRepeat the process for the second manifold if applicable.\u003c\/li\u003e\n\u003cli\u003eStart the engine and inspect both drain plugs for leaks while the engine warms up.\u003c\/li\u003e\n\u003cli\u003eIf any seepage is detected, shut down the engine and re-tighten slightly. Do not operate with leaking drain plugs.\u003c\/li\u003e\n\u003cli\u003eTest the quick-drain function by opening the plastic cock; close immediately and confirm a watertight seal before use.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this drain plug kit fits my Volvo Penta engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine is a GM-based V6 or V8 model (4.3L, 5.0L, 5.7L, 7.4L, or 8.2L). Check the existing drain plug thread size—it should be 20.50mm × 1.75 metric. Cross-reference your current OEM part number (479956, GLM 13982, Sierra 18-4227, etc.) with the table above.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Will this kit work on OMC engines?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, this kit fits OMC 4.3L and 5.7L GM-based engines only. It is not compatible with OMC Ford or Chrysler-based blocks. Confirm your OMC engine uses GM architecture before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the manifold drain plugs?\u003c\/strong\u003e\u003cbr\u003e\nA: Inspect drain plugs annually during winterization or routine service. Replace immediately if you notice cracking in the plastic handle, thread wear, leaks, or difficulty opening\/closing the drain cock. Exposure to saltwater or harsh conditions may shorten service life.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why is my drain plug leaking after installation?\u003c\/strong\u003e\u003cbr\u003e\nA: Leaks are typically caused by insufficient thread sealant, cross-threading during installation, or damaged manifold threads. Remove the plug, inspect threads on both the plug and manifold, reapply marine sealant, and reinstall carefully by hand first to avoid cross-threading.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I leave the drain cock open during storage?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, leaving the drain cock open during off-season storage is recommended to allow complete water drainage and prevent freeze damage. Just remember to close it securely before launching in the spring.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between OEM and aftermarket drain plug kits?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51981023215929,"sku":"24PK144","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_896a1eb3-3f90-4f83-868c-18a5355a083e.png?v=1772414767","url":"https:\/\/jlmmarine.com\/ru\/products\/479956-manifold-drain-plug-kit-for-volvo-penta-gm-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}