--- product_id: 663470367 title: "15pc 9mm Lower Unit Drain Screw Gasket 26-830749 Replacement for Mercury" brand: "automajor" price: "β‚©19060" currency: KRW in_stock: true reviews_count: 8 category: "Automajor" url: https://www.desertcart.kr/products/663470367-15pc-9mm-lower-unit-drain-screw-gasket-26-830749-replacement store_origin: KR region: South Korea --- # 15-pack for multiple full gear lube services Stainless steel core for corrosion resistance Rubber coating ensures watertight seal 15pc 9mm Lower Unit Drain Screw Gasket 26-830749 Replacement for Mercury **Brand:** automajor **Price:** β‚©19060 **Availability:** βœ… In Stock ## Summary > πŸ›₯️ Keep your lower unit leak-free and your adventures worry-free! ## Quick Answers - **What is this?** 15pc 9mm Lower Unit Drain Screw Gasket 26-830749 Replacement for Mercury by automajor - **How much does it cost?** β‚©19060 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/663470367-15pc-9mm-lower-unit-drain-screw-gasket-26-830749-replacement) ## Best For - automajor enthusiasts ## Why This Product - Trusted automajor brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Bulk Value Pack:** 15 gaskets includedβ€”enough for 7+ complete lower unit gear lube services, saving time & money. - β€’ **Marine-Grade Durability:** Stainless steel core resists rust & corrosion in salt & freshwater environments. - β€’ **Prevent Costly Failures:** Replacing gaskets every service prevents water intrusion, gear damage & expensive repairs. - β€’ **Precision Seal Technology:** Dual-sided bonded rubber conforms to microscopic surface imperfections for leak-proof protection. - β€’ **Universal Mercury Compatibility:** Fits Mercury, Mercruiser, Mariner & Quicksilver outboards & stern drives (1984-2024 models). ## Overview The AUTOMAJOR 15-Pack 9mm Lower Unit Drain Screw Gaskets are premium rubber-coated stainless steel washers designed as direct replacements for Mercury Marine OEM parts 26-830749 and equivalents. Engineered for marine environments, these gaskets provide a reliable, watertight seal on lower unit drain and vent screws across Mercury, Mercruiser, Mariner, and Quicksilver outboards and stern drives from 1984 to 2024. Each pack includes 15 gaskets, enough for multiple gear lube services, helping prevent water intrusion and costly lower unit failures. ## Description The AUTOMAJOR 15-Pack Lower Unit Gear Case Drain Screw Gasket is a rubber-coated stainless steel washer and a direct replacement for Mercury Marine OEM part number 26-830749. These 9mm gaskets seal the lower unit gear case drain and fill screws on Mercury, Mercruiser, Mariner, and Quicksilver outboard motors and stern drives β€” essential for every gear lube service on virtually any Mercury marine engine built in the last four decades. This gasket replaces Mercury OEM 26-830749 and 26-930749, and cross-references with Mercury 26-8M0204694 and 8M0204693 (newer-style replacement). Dimensions: 9mm / 0.35in inner diameter, 14mm / 0.55in outer diameter, 1.5mm / 0.06in thickness. If your outboard or stern drive uses any of these part numbers, these gaskets are the correct replacement. The lower unit gear case on every Mercury, Mercruiser, Mariner, and Quicksilver outboard motor or stern drive has two drain points: the lower drain screw (used for draining old gear oil) and the upper vent/fill screw (used for venting during draining and refilling new gear oil). Both screws use the same 26-830749 gasket β€” so each complete gear lube service requires 2 fresh gaskets per lower unit. Marine engines operate in some of the harshest conditions imaginable β€” submerged in saltwater or freshwater, exposed to constant moisture, temperature cycling, and high vibration loads. Reusing old drain screw gaskets is one of the most common causes of water intrusion into the lower unit gear case β€” leading to water-fouled gear oil (the classic milky-coffee gear lube on the dipstick), gear damage, bearing failure, and eventually catastrophic lower unit failure costing thousands to repair. Replacing both gaskets at every gear lube service is cheap insurance against expensive repairs. These gaskets are manufactured with a stainless steel core and a bonded rubber coating on both sides. The stainless steel maintains structural integrity under torque while the rubber sealing surface conforms to microscopic imperfections in the lower unit housing β€” creating a watertight seal even on older lower units with surface wear. Stainless steel will not rust or corrode in saltwater, freshwater, or any marine environment. Installation: with the lower unit positioned vertically, place a drain pan under the lower drain screw, remove the lower drain screw to drain old gear oil, remove the upper vent screw to vent (must be removed for proper draining), once fully drained reinstall both screws temporarily, position lower unit upright, remove just the upper vent screw, fill with fresh gear lube through the lower drain screw using a pump until oil weeps from the upper vent hole, install upper vent screw with new gasket, then install lower drain screw with new gasket, torque both to manufacturer specification (typically 3-4 ft-lbs / 4-5 Nm). Always use Mercury 75W-90 or a compatible gear lube. These gaskets fit Mercury Marine outboards from 2hp through 400hp including Mercury 4-stroke, Mercury 2-stroke, Mercury Verado, Mercury OptiMax, Mercury Pro XS, Mercruiser stern drives (Alpha One, Bravo One/Two/Three, R, MR, MerCruiser inboards), Mariner outboards (2-300hp), and Quicksilver outboards. Model years 1984-2024. Always confirm your engine uses one of the listed part numbers before ordering. Backed by AUTOMAJOR β€” replacement parts for Mercury Marine boat owners and marine mechanics. Review: New style washer - New style Review: Just what I wanted. - Work as described. ## Features - - Direct replacement for Mercury Marine OEM 26-830749 and 26-930749. Cross-references with newer Mercury part numbers 26-8M0204694 and 8M0204693. Dimensions: 9mm / 0.35in ID, 14mm / 0.55in OD, 1.5mm / 0.06in thickness. 15-pack provides enough gaskets for multiple complete lower unit gear lube services β€” each service requires 2 gaskets (one for lower drain screw, one for upper vent screw). - - Used on lower unit gear case drain and fill screws on Mercury, Mercruiser, Mariner, and Quicksilver outboard motors and stern drives. Each lower unit has two drain points: the lower drain screw (for draining old gear oil) and the upper vent/fill screw (for venting during draining and refilling). Both use the same 26-830749 gasket. - - Stainless steel core with bonded rubber coating on both sides. Stainless steel will not rust or corrode in saltwater, freshwater, or any marine environment. The rubber sealing surface conforms to microscopic imperfections in the lower unit housing for a watertight seal even on older units with surface wear. Resistant to gear lube, saltwater, freshwater, and all marine fluids. - - Reusing old drain screw gaskets is one of the most common causes of water intrusion into the lower unit gear case β€” leading to water-fouled gear oil (the classic milky-coffee gear lube on the dipstick), gear damage, bearing failure, and eventually catastrophic lower unit failure costing thousands to repair. Replacing both gaskets at every gear lube service is cheap insurance. - - Compatible with Mercury Marine outboards 2hp through 400hp including Mercury 4-stroke, 2-stroke, Verado, OptiMax, Pro XS; Mercruiser stern drives Alpha One, Bravo One/Two/Three, R, MR, and MerCruiser inboards; Mariner outboards 2-300hp; Quicksilver outboards. Model years 1984-2024. Torque drain and vent screws to manufacturer specification (typically 3-4 ft-lbs / 4-5 Nm). Use Mercury 75W-90 gear lube. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0D9TQMJTH | | Best Sellers Rank | #154 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Drain Plug Gaskets | | Brand | AUTOMAJOR | | Brand Name | AUTOMAJOR | | Customer Reviews | 4.4 out of 5 stars 15 Reviews | | Item Highlight | Also 26-930749 26-8M0204694 8M0204693 Fits Mercruiser Alpha Bravo Verado OptiMax Mariner Quicksilver outboard by AUTOMAJOR | | Item Shape | Round | | Item Thickness | 1.5 millimeters | | Manufacturer | AUTOMAJOR | | Material | Rubber, Stainless Steel | | Material Type | Rubber, Stainless Steel | | Model | Boat M9 | | Number of Items | 15 | | Part Number | 26-830749 | | Shape | Round | | UPC | 697794360610 | ## Product Details - **Brand:** AUTOMAJOR - **Item Thickness:** 1.5 Millimeters - **Material:** Rubber, Stainless Steel - **Shape:** Round - **UPC:** 697794360610 ## Images ![15pc 9mm Lower Unit Drain Screw Gasket 26-830749 Replacement for Mercury - Image 1](https://m.media-amazon.com/images/I/71mbhYDqD3L.jpg) ![15pc 9mm Lower Unit Drain Screw Gasket 26-830749 Replacement for Mercury - Image 2](https://m.media-amazon.com/images/I/8113N9AAFKL.jpg) ![15pc 9mm Lower Unit Drain Screw Gasket 26-830749 Replacement for Mercury - Image 3](https://m.media-amazon.com/images/I/71pTCGrZLhL.jpg) ![15pc 9mm Lower Unit Drain Screw Gasket 26-830749 Replacement for Mercury - Image 4](https://m.media-amazon.com/images/I/716nmBdwxfL.jpg) ![15pc 9mm Lower Unit Drain Screw Gasket 26-830749 Replacement for Mercury - Image 5](https://m.media-amazon.com/images/I/81xlhdxkWeL.jpg) ## Available Options This product comes in different **Model** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ New style washer *by P***A on September 12, 2026* New style ### ⭐⭐⭐⭐⭐ Just what I wanted. *by A***R on September 4, 2026* Work as described. ### ⭐⭐⭐⭐⭐ PERFECT FIT FOR MY 2024 MERCUY 50hp *by A***R on March 30, 2026* PERFECT FIT FOR MY 2024 MERCUY 50hp! they shipped fast and I have enough for several lower unit service events. These are exactly as described and even buying 15pcs they are far les expensive than the Mercury branded or OEM parts! ## Frequently Bought Together - 15 Pcs Oil Drain Plug Rubber Coated Stainless Steel Gasket - 9mm Replacement for Mercury-Mercruiser Gear Case Drain Plug OEM 26-830749 Fits for 1984-2012 by AUTOMAJOR - Slippery Pete Fluid Pump for Gallon Bottles and Wide Mouth Quart Bottles (Not for Standard Quart Bottles) - Transfer Gear Oil, Transmission and Differential Fluid, Antifreeze with This 30cc Hand Pump - Toyota 00289-ATFWS Lexus & Automatic Transmission Fluid WS ATF World Standard, Pack of 4 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.kr/products/663470367-15pc-9mm-lower-unit-drain-screw-gasket-26-830749-replacement](https://www.desertcart.kr/products/663470367-15pc-9mm-lower-unit-drain-screw-gasket-26-830749-replacement) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-10-09*