This is Hydrastar electric over hydraulic unit MHBA-16, a 1600 psi vented marine unit for disc brakes, ideal for boat trailers. Hydrastars line of XTRA Duty Marine electric over hydraulic units are designed specifically for boat trailers in both freshwater and saltwater environments. Innovative technologies pioneered by Hydrastar allow this unit to perform at optimal levels in some of the toughest conditions, making it extremely reliable and consistent. Confidence is key with trailer braking, and with a Hydrastar unit, confidence is exactly what you will have. This unit is ideal for boat trailers with 1 to 3 axles, and with a 1600 psi rating, will handle your disc brakes with efficiency. Electric over hydraulic units use the electric signal as transmitted by your vehicles brake controller as a result of depressing the brake pedal to create hydraulic pressure for your disc brakes in real-time, meaning a surge is not required. Nothing compares to the response, and braking strength of an electric over hydraulic unit for disc brakes. This translates to more control, and shorter stopping distance. Specifications: -For use with 1 to 3 trailers axles -Maximum Output 1600 psi -2 Year Manufacturers Warranty from the Date of Purchase -12 V DC Operation -Hydraulic Hose Line measures 3/16" -Unit measures 11.8" L x 3" W x 7.3" H -Four 12 ga Wire Configuration: Black - Constant Power, Blue - Brake Controller, White - Ground, Yellow - Breakaway -DOT CFR-393 Braking Compliant Features: -Sealed, extruded anodized aluminum unit -Marine Grade EPDM Gaskets seal the housing unit -Stainless Steel hardware -Vented end plate that allows for the release of moisture, pressure, and temperature from inside the housing unit -Solid state electronics with proportional pressure value control for efficient smooth braking performance -Integrated bleeder screw for brake line air release -Lower Amp Draw that only requires one Breakaway Battery -3 inch Width makes it easy to integrate onto a trailer -Made in USA