Champion Marine Spark Plug UL77V # 831s #831 #831M Purchase is for one plug. Plug will be from bulk shop pack. The spark plug is designed to withstand high temperatures and fits most small-engine brands and models. • For use with small marine engines • Champion copper plus small engine plugs resist fouling and provide superior corrosion resistance • Feature a copper core electrode that provides increased conductivity and heat control while delivering good overall wear characteristics • Semiconductor suppressor: Eliminates radio frequency interference • Engineered to exceed OE designs and maximum durability • Designed for easy starting • Plug Type: UL77V Seat Type: Gasket Hex Size: 13/16 Inch (20 mm) Thread Size: 14 mm Plug Reach: 0.531 in (13.5 mm) Preset gap: 0.048 to 0.053 in MPN: 831s UPC: 037551660018 USA domestic shipments are shipped USPS First Class Mail with Tracking International shipments are shipped USPS First Class International Mail with Tracking