Direct replacement for Honda/Acura OEM 90471-PX4-000 (90471PX4000). Cross-references with aftermarket part number 16955. This is the 18mm transmission and differential drain plug washer — not the 14mm engine oil drain plug washer (94109-14000). Dimensions: 18.2mm / 0.72in ID, 25.8mm / 1.02in OD, 1.9mm / 0.07in thickness. 15-pack value for years of transmission and differential maintenance. Manufactured from high-purity aluminum for excellent flexibility, corrosion resistance, and sealing performance. Aluminum crush washers deform under torque to fill microscopic surface imperfections between the drain plug and transmission case, creating a tight, leak-free barrier. Resistant to degradation from ATF DW-1, CVT fluid HCF-2, manual transmission fluid, and Honda Dual Pump Fluid II. Crush washers are single-use components — Honda recommends replacing the gasket at every transmission fluid change and every differential fluid change. Reusing an old crush washer is one of the most common causes of transmission fluid leaks after service. A fresh washer ensures a proper seal every time, keeping your garage floor clean and your fluid levels full. Used on both the transmission fluid drain plug and the rear differential drain plug on Honda and Acura vehicles. Compatible with automatic, CVT, and manual transmission applications. Also fits the rear differential drain and fill plugs on AWD models including CR-V, Pilot, Passport, Ridgeline, MDX, RDX, and TLX. One part number covers multiple drain points on the same vehicle. Compatible with Honda Accord (1990-2024), Civic (1993-2024), CR-V (1997-2024), Element (2003-2011), Fit (2007-2020), HR-V (2016-2024), Odyssey (1995-2024), Passport (2019-2024), Pilot (2003-2024), Ridgeline (2006-2024), S2000, Prelude, Insight, Crosstour, CR-Z, Clarity, del Sol; Acura CL, ILX, Integra, MDX, RDX, RSX, TL, TLX, TSX. Please verify your OEM washer number before ordering. The AUTOMAJOR 15-Pack Transmission Drain Plug Crush Washer is a premium aluminum gasket designed as a direct replacement for Honda/Acura OEM part number 90471-PX4-000. These 18mm aluminum crush washers are single-use sealing components used on transmission fluid drain plugs and rear differential drain plugs on Honda and Acura vehicles. This gasket replaces Honda/Acura OEM 90471-PX4-000 (90471PX4000) and cross-references with aftermarket part number 16955. Dimensions: 18.2mm / 0.72in inner diameter, 25.8mm / 1.02in outer diameter, 1.9mm / 0.07in thickness. If your vehicle uses any of these part numbers, these washers are the correct replacement. Important: this is the 18mm transmission and differential washer — not the 14mm engine oil drain plug washer (94109-14000). Honda vehicles use different size washers for different drain plugs. The 18mm washer (this product) is used on the transmission fluid drain plug and the rear differential drain plug. The 14mm washer is used on the engine oil drain plug. Make sure you are ordering the correct size for your application. When you torque the transmission drain plug, the soft aluminum washer compresses and deforms to fill microscopic surface imperfections between the plug flange and the transmission case, creating a tight, leak-free barrier. Reusing an old crush washer is one of the most common causes of transmission fluid leaks after service — the washer has already been compressed and will not seal properly a second time. With 15 washers in this pack, you have enough gaskets for 15 fluid changes — years of transmission and differential maintenance. These washers are manufactured from high-purity aluminum for excellent flexibility, corrosion resistance, and sealing performance. Aluminum does not rust and is resistant to degradation from ATF (Automatic Transmission Fluid), CVT fluid, manual transmission fluid, and differential fluid formulations including Honda DW-1, HCF-2, and Honda Dual Pump Fluid II. Installation takes seconds: remove the old washer from the drain plug (discard it), place a fresh AUTOMAJOR aluminum washer on the plug, thread the plug into the transmission or differential case by hand, and torque to Honda's specification. Do not overtighten — excessive torque can damage the transmission case threads. These washers fit Honda Accord (1990-2024), Civic (1993-2024), CR-V (1997-2024), Crosstour (2010-2015), CR-Z (2011-2016), Clarity (2017-2021), Element (2003-2011), Fit (2007-2020), HR-V (2016-2024), Insight (2000-2024), Odyssey (1995-2024), Passport (2019-2024), Pilot (2003-2024), Prelude (1992-2001), Ridgeline (2006-2024), S2000 (2000-2009), and Civic del Sol (1993-1997); Acura CL (1997-2003), ILX (2013-2022), Integra (1990-2001), MDX (2001-2024), RDX (2007-2024), RSX (2002-2006), TL (1995-2014), TLX (2015-2024), and TSX (2004-2014). Always confirm your vehicle's OEM washer part number before ordering. Backed by AUTOMAJOR — trusted OEM-quality replacement parts for Honda and Acura owners.