Honda OEM O-Ring - 78118-YB3-004
This part fits;
WB20T DRA - WZAL 1000001-1999999 - CASING
WB20X C - CASING / IMPELLER
WB20XK1 AC1 - CASING (WB20XK1, WD20XK1)
WB20XK1 C1 - CASING (WB20XK1, WD20XK1)
WB20XK2 A - WABT 1000001-1999999 - CASING / IMPELLER (WB20XK2/XT2/XT3/XT4)
WB20XK2 A - WABT 1000001-1999999 - CASING / IMPELLER (WB20XK2/XT2)
WB20XK2 A - WABT 1000001-1999999 - CASING / IMPELLER (WB20XK2/XT2/XT3)
WB20XT2 A - WABT 2000001-2999999 - CASING / IMPELLER (WB20XK2/XT2/XT3/XT4)
WB20XT2 A - WABT 2000001-2999999 - CASING / IMPELLER (WB20XK2/XT2)
WB20XT2 A - WABT 2000001-2999999 - CASING / IMPELLER (WB20XK2/XT2/XT3)
WB20XT3 A - WABT 3000001-9999999 - CASING / IMPELLER (WB20XK2/XT2/XT3)
WB20XT3 A - WABT 3000001-9999999 - CASING / IMPELLER (WB20XK2/XT2/XT3/XT4)
WD20X C - CASING / IMPELLER
WD20XK1 AC1 - CASING (WB20XK1, WD20XK1)
WD20XK1 AC1/A - CASING (WB20XK1, WD20XK1)
WD20XK1 C1 - CASING (WB20XK1, WD20XK1)
WD20XK1 C1/A - CASING (WB20XK1, WD20XK1)
WD20XK1 C1/B - CASING (WB20XK1, WD20XK1)
WH15XK1 AC1 - GC01 2000001-4299999 - CASING
WH15XK1 AC1/A - GC01 4300001-9999999 - CASING
WH15XK2 AC1 - WZAV 1000001-9999999 - CASING
WH20X CR - GX140 1000001-3263982 - CASING
WH20XK1 AC1 - GC02 2000001-8669999 - CASING
WH20XK1 AC1/A - GC02 8670001-9099999 - CASING
WH20XK1 AC1/B - WASJ 1000001-9999999 - CASING
WH20XK2 AC1 - WASJ 1100001-9999999 - CASING
This is an OEM Honda part.
Thank you for looking!