Mercury - Quicksilver 812966A12 Water Pump Repair Kit Mercury & Mariner 4-Stroke 30-60HP Outboards Complete OEM Kit 812966A12. Overview. Every seasoned boater knows how critical a reliable water pump is. It's the part that quietly keeps your engine cool, trip after trip. The Quicksilver 812966A12 Water Pump Repair Kit gives your Mercury or Mariner 4-stroke outboard (30-60HP) a full refresh, restoring proper water flow and cooling performance.. This kit isn't just a quick fix - it's one of the mo