{"product_id":"pipe-plug-1-4-npt-universal-marine-applications-replaces-22-36382-18-4256-9-40545","title":"Pipe Plug 1\/4\" NPT – Universal Marine Applications (Replaces 22-36382, 18-4256, 9-40545)","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\u003ePipe Plug 1\/4\" NPT – Universal Marine Applications\u003c\/strong\u003e is a brass fitting designed for universal marine engine applications. Compatible with Mercury Mercruiser engines including the 7LX 4BBL GM 350 V-8 '96 and similar models, this pipe plug provides a reliable seal for threaded openings in cooling, fuel, and hydraulic systems.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket replacement directly interchanges with Mercury Quicksilver 22-36382, Sierra 18-4256, and GLM 9-40545.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1\/4\" NPT threaded connection for standard marine pipe fittings\u003c\/li\u003e\n  \u003cli\u003eBrass construction resists corrosion in saltwater and freshwater environments\u003c\/li\u003e\n  \u003cli\u003eUniversal fitment across multiple marine engine brands and systems\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\u003eMercury Quicksilver\u003c\/td\u003e\n        \u003ctd\u003e22-36382\u003c\/td\u003e\n        \u003ctd\u003eOEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-4256\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e9-40545\u003c\/td\u003e\n        \u003ctd\u003eAftermarket equivalent\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\u003eMercury Mercruiser\u003c\/td\u003e\n        \u003ctd\u003e7LX 4BBL GM 350 V-8\u003c\/td\u003e\n        \u003ctd\u003e22-36382\u003c\/td\u003e\n        \u003ctd\u003e1996 model year\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eUniversal\u003c\/td\u003e\n        \u003ctd\u003eMarine Applications\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e1\/4\" NPT threaded systems\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\u003eThread Size\u003c\/dt\u003e\n\u003cdd\u003e1\/4\" NPT\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003eBrass\u003c\/dd\u003e\n  \u003cdt\u003eThread Length\u003c\/dt\u003e\n\u003cdd\u003e0.62\"\u003c\/dd\u003e\n  \u003cdt\u003eThread Specification\u003c\/dt\u003e\n\u003cdd\u003e.250-18\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eUniversal Marine\u003c\/dd\u003e\n  \u003cdt\u003eFinish\u003c\/dt\u003e\n\u003cdd\u003eNatural brass\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1 × Pipe Plug\u003c\/strong\u003e (1\/4\" NPT)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eIdentify the 1\/4\" NPT threaded port requiring sealing or plugging on your engine block, manifold, or component.\u003c\/li\u003e\n  \u003cli\u003eClean the threaded opening thoroughly, removing old sealant, debris, or corrosion.\u003c\/li\u003e\n  \u003cli\u003eApply marine-grade thread sealant or PTFE tape to the plug threads in a clockwise direction.\u003c\/li\u003e\n  \u003cli\u003eHand-thread the pipe plug into the port until snug, ensuring proper alignment to avoid cross-threading.\u003c\/li\u003e\n  \u003cli\u003eTighten the plug using an appropriately sized wrench to the manufacturer's torque specification for brass fittings.\u003c\/li\u003e\n  \u003cli\u003eDo not overtighten, as brass is softer than steel and excessive torque may strip threads or crack the fitting.\u003c\/li\u003e\n  \u003cli\u003eInspect for leaks after engine startup or system pressurization, and retighten if necessary.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this plug fit my engine if I have a 1\/4\" NPT port?\u003c\/summary\u003e\n  \u003cp\u003eYes, this plug is designed for standard 1\/4\" NPT threaded openings and will fit any marine engine or component with matching threads. Always verify thread size and pitch before installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I reuse this pipe plug after removal?\u003c\/summary\u003e\n  \u003cp\u003eWhile brass plugs can often be reused, inspect threads carefully for damage or deformation. Always apply fresh thread sealant during reinstallation to ensure a leak-free seal.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat torque specification should I use?\u003c\/summary\u003e\n  \u003cp\u003eConsult your engine service manual for brass fitting torque values. Typical range for 1\/4\" NPT brass plugs is 7–12 ft-lbs, but always follow manufacturer guidelines to prevent thread damage.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs PTFE tape or pipe sealant better for this application?\u003c\/summary\u003e\n  \u003cp\u003eBoth work effectively. PTFE tape is cleaner and easier to remove; marine-grade pipe sealant provides stronger resistance to vibration and thermal cycling. Choose based on your service environment and maintenance preferences.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are signs this plug needs replacement?\u003c\/summary\u003e\n  \u003cp\u003eLook for coolant, fuel, or oil seepage around the plug, visible corrosion or pitting on brass surfaces, or stripped threads. Replace immediately if any leak or thread damage is detected.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan this be used in saltwater applications?\u003c\/summary\u003e\n  \u003cp\u003eYes, brass offers good corrosion resistance in marine environments. For extended saltwater exposure, inspect periodically and replace if dezincification (pink\/red discoloration) occurs.\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":51025915052347,"sku":"3045","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/s-l1600_ba06784a-2d12-456e-a5fc-ff99033efd35.webp?v=1772975113","url":"https:\/\/seasierra.com\/products\/pipe-plug-1-4-npt-universal-marine-applications-replaces-22-36382-18-4256-9-40545","provider":"SeaSierra","version":"1.0","type":"link"}