Details

• Brand:

  

• SKU:

  21049-AE000

• Other Names:

  Engine Coolant Inlet Flange O-Ring, Water Inlet O-Ring, Connector Pipe O-Ring, Engine Coolant Water Outlet Seal, Water Outlet Seal, Engine Coolant Thermostat Housing O-Ring, Thermostat Housing O-Ring, Water Pipe O-Ring, Water Inlet Pipe O-Ring, Seal-O Ring

• Description:

  Description:

  Genuine OEM Nissan Engine Coolant Pipe O-Ring Seal — Part # 21049-AE000

  Replace your coolant pipe O-ring with the factory-correct seal for a wide range of Nissan engines. This genuine OEM large-diameter O-ring seals coolant pipe connections at critical points throughout the cooling system — including the thermostat housing outlet pipe (5.6L), intake valley coolant pipe (4.0L), and water pump housing pipe (2.5L Korea-built). A small but critical sealing component that must be replaced any time the coolant pipe is removed.

  Part Details:

  • Part Number: 21049-AE000
  • Other Names: Seal-O Ring, Engine Coolant Pipe O-Ring, Water Inlet O-Ring, Thermostat Housing O-Ring, Connector Pipe O-Ring, Water Outlet Seal, Water Pipe O-Ring
  • Condition: New, Genuine OEM Nissan
  • Size: Large
  • Sold Individually: 1 O-ring per listing — order quantity needed for your repair

  ⚠️ Single-Use — Cannot Be Reused: This O-ring seal cannot be reused or reinstalled once removed. Always replace with a new seal any time the coolant pipe is disconnected. Reusing a compressed O-ring risks a coolant leak immediately after installation.

  Application Locations by Engine:

  • 5.6L VK56VD/VK56DE — Thermostat-to-pipe / outlet pipe to thermostat housing (Large)
  • 4.0L VQ40DE — Intake valley coolant pipe location
  • 2.5L QR25DE (Korea-built) — Pipe to water pump housing

  Always confirm your engine and application location with your VIN before ordering.

  Compatible Vehicles (Partial List — 2003–2024):

  • 2004–2024 Nissan Armada (5.6L VK56VD/VK56DE)
  • 2004–2024 Nissan Titan (5.6L VK56VD/VK56DE)
  • 2005–2021 Nissan Frontier (4.0L VQ40DE)
  • 2005–2012 Nissan Pathfinder (4.0L VQ40DE)
  • 2005–2015 Nissan Xterra (4.0L VQ40DE)
  • 2007–2018 Nissan Altima (2.5L QR25DE — Korea built)
  • 2008–2020 Nissan Rogue (2.5L QR25DE — Korea built)
  • 2012–2021 Nissan NV Full Size Van (5.6L VK56VD)

  Always confirm fitment using your VIN before purchasing.

  Why buy OEM? Aftermarket coolant pipe O-rings are frequently the wrong durometer, wrong diameter, or wrong material compound for coolant compatibility — causing seepage even when new. The genuine Nissan O-ring is manufactured to the exact inner diameter, cross-section, and material specification for a reliable, leak-free seal at these critical coolant pipe connections.

  When you need this part:

  • Thermostat or thermostat housing replacement — O-ring must be replaced
  • Water pump service — pipe O-ring replaced during pump removal
  • Coolant leak at the thermostat housing or coolant pipe connection
  • Cooling system service requiring pipe disconnection
  • Preventive replacement during major cooling system work

  Ships fast from Walser Nissan Wayzata — an authorized Nissan dealership. Message us your VIN and we'll confirm fitment before you buy.

• Condition: New
• Notes: Part cannot be reused/reinstalled.

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