WD30 XK1 AC1/A (GC02) - Honda Water Pump, Made in Japan (SN: GC02-8670001 - GC02-9999999). WD30 XK1 AC1 (GC02) - Honda Water Pump, Made in Japan (SN: GC02-2000001 - GC02-8669999). WD30 XK1 C1/A (GC02) - Honda Water Pump, Made in Japan (SN: GC02-8670001 - GC02-9999999).