FASWORX Water Pump Impeller Repair Kit Replaces Mercury Mariner 821354A2 Sierra 18-4531 - Fits 2-Stroke & 4-Stroke 25 30 40 45 50 HP Outboard Motors - Lower Unit Cooling Rebuild Set

Keep Your Outboard Running Cool with FASWORX Overheating is one of the quickest ways to damage a marine engine. The FASWORX Water Pump Impeller Repair Kit provides everything you need to successfully rebuild your lower unit's cooling system and get back on the water with confidence. Manufactured to meet or exceed OEM specifications, this kit is the perfect solution for routine maintenance or replacing a failed water pump on your Mercury, Mariner, or Force outboard motor. By using high-quality materials—such as a resilient neoprene impeller and a 316 stainless steel wear plate—FASWORX ensures reliable water pressure and superior resistance to saltwater corrosion.

• DIRECT OEM REPLACEMENT: Precision-engineered to directly replace Mercury/Mariner OEM part numbers 821354A2, 46-821354A2, 821354A1, and 821354A04. Also crosses over to aftermarket part numbers Sierra 18-4531, GLM 12045, and SEI 96-265-03BK.
• BROAD ENGINE COMPATIBILITY: Fits a wide range of outboard motors including Mercury and Mariner 4-Stroke (25, 30, 40, 45, 50 HP) and 2-Stroke (30, 40, 50 HP) from 1998 & Up, as well as Force 2-Stroke (40, 50 HP) from 1995–1999.
• PREMIUM MARINE-GRADE MATERIALS: Built for harsh freshwater and saltwater environments. Features a durable neoprene rubber impeller for optimal water flow and a heavy-duty 316 stainless steel wear plate for maximum corrosion resistance.
• IMPORTANT FITMENT NOTE: Outboard fitment is strictly determined by your engine's Serial Number block, not just the year or horsepower. Standard and BigFoot gearcases often require different kits. Always verify your serial number matches OEM part 821354A2 before purchasing.