3/4" Solid Brass 4-Way Manual Heater Control Valve For Cars - 19mm Barb, Includes 4 Clamps, Bypass & Improve Cooling

Is your car's A/C not cooling enough in summer? This solid brass 4-way heater control valve might be the fix. It's a manual valve you install in your heater hose lines to completely block hot coolant from entering the heater core when you don't need heat, which can significantly improve your A/C's cooling performance and might even help with fuel economy. It's made from durable solid brass with a plated handle, so it won't corrode and can handle temps from -20°C to 305°C and pressure up to 1.6 MPa. The barb size is 3/4 inch (19mm), and it comes with 4 hose clamps for installation. It lets you control four hose connections, creating two different coolant flow paths (summer bypass mode and winter heat mode). Installation is pretty straightforward—just cut your hoses and clamp this in line—but you MUST do it when the engine is completely cold and follow the proper bleeding procedure to avoid air pockets. A great DIY upgrade for older cars or anyone wanting better climate control efficiency.