Transmission Assembly Seal
This gasket belongs to the transmission assembly and is listed directly with the transmission case and internal transmission components. Its purpose is to provide a sealing interface at the case joint during assembly.
Honda · Genuine OEM Part
Honda identifies this part as the GASKET, TRANSMISSION CASE (NICHIAS), a gasket used in the transmission assembly. It is listed alongside the transmission case, shafts, gears, bearings, seals and related hardware in Honda’s transmission parts catalog.
As a transmission-case gasket, its general function is to seal the joint between mating case surfaces and help retain the assembly’s lubricant when the case is properly assembled. Honda lists one gasket for the transmission assembly, and the catalog identifies NICHIAS as part of the official description.
This gasket belongs to the transmission assembly and is listed directly with the transmission case and internal transmission components. Its purpose is to provide a sealing interface at the case joint during assembly.
Honda’s catalog name includes the NICHIAS designation, making the complete description useful when distinguishing this gasket from other sealing parts listed elsewhere in the parts catalog.
The Honda part number identifies this specific transmission case gasket. Matching the complete number and catalog description helps prevent confusion with the separate left-cover, stator-base and other gasket listings.
| Honda Part Number | 21395-K97-T02 |
|---|---|
| Honda Catalog Description | GASKET, TRANSMISSION CASE (NICHIAS) |
| Part Type | Gasket |
| Assembly | Transmission |
| Required quantity | 1 |
| Manufacturer designation | NICHIAS |
| Model | Type | Model Years |
|---|---|---|
| ADV150A | Motorcycle | 2021–2023 |
| PCX150 | Motorcycle | 2019–2020 |
| PCX150A ABS | Motorcycle | 2019–2020 |
Model applications as listed in Honda's dealer parts catalog for part number 21395-K97-T02.
Verify the Honda OEM part number for your specific model before ordering.

Compatible motorcycles, ATVs & side-by-sides
Verify your vehicle's model, year and specific configuration before ordering.