Mercury - Quicksilver 817275A2 Water Pump Upper Housing Kit Mercury 4-Stroke Outboards (40-300HP) 817275A2. Overview. Keep your outboard's cooling system performing like new with the Quicksilver 817275A2 Water Pump Upper Housing Kit. Designed for most Mercury 4-stroke outboards (40-300HP), this OEM kit replaces worn or corroded upper housing components to maintain strong, reliable water flow through your cooling system.. The five-piece kit includes the upper housing, seals, and a stainless steel