Johnson Pump CM90 Circulation Pump - 23.7GPM - 12V - 1-½" Outlet

The Johnson Pump CM90 Circulation Pump – 23.7GPM – 12V – 1-½" Outlet is purpose-built for anglers and boaters who demand reliable engine cooling and fluid circulation on the water. Whether you're running a saltwater fishing charter, cruising offshore, or maintaining a cabin cruiser's heating system, this circulation pump handles the job with proven durability. Johnson Pump has spent decades engineering solutions for marine environments where corrosion, vibration, and thermal stress are constant threats. This unit is designed to keep your boat's cooling loop steady and your engine operating at optimal temperature, even during extended summer runs or tropical conditions.

Built around a 12-volt electrical platform, the CM90 delivers 23.7 gallons per minute of flow—sufficient capacity for mid-size recreational and commercial vessels without excessive power draw on your battery or alternator. The 1-½" outlet accommodates standard marine hose diameters and integrates seamlessly into existing cooling manifolds and heat exchanger assemblies. The pump's compact footprint (7 x 5 x 11 inches) and modest weight of 6.6 pounds allow flexible installation in tight engine compartments where space is at a premium. Johnson's construction emphasizes corrosion-resistant materials and thermal stability, critical traits when saltwater spray and engine heat compete to degrade inferior pumps within a single season.

Boat owners upgrading cooling systems, restoring vintage vessels, or replacing failed circulation pumps will find the Johnson CM90 a drop-in solution for freshwater and saltwater applications alike. Installation requires basic marine mechanical skills—connect 12-volt positive and negative leads, secure the pump bracket to an engine block or stringers, and attach inlet and outlet hoses with standard marine clamps. Compatibility spans most inboard and auxiliary engine installations, though you should verify outlet thread size and hose routing before ordering. For anyone serious about engine longevity and trouble-free cruising, this pump delivers the circulation performance and reliability that separate weekend boaters from those who actually live on the water.