This listing is about one (1) NGK Spark Plug for HONDA watercraft engines Aqua Trax F-12 (ARX1200N3 A) 125hp, 1200cc, yr. 2002-2007, Aqua Trax F-12X (ARX1200T3 A) 165hp, 1200cc, yr. 2002-2007 and Aqua Trax F-12X GPS (ARX1200T3D A) 165hp, 1200cc, yr. 2005-2007, which replaces OEM Part #31911-HW1-671.