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Bard part 8603-042 is an OEM 3-way water valve used on select Bard HVAC and water source applications to direct or divert water flow through the unit so the system can maintain proper operation during heating and cooling demands. When a 3-way valve begins to stick, leak, or fail to shift flow correctly, you can see poor capacity, unstable leaving water temperatures, or nuisance shutdowns, so replacing it with the correct Bard valve helps restore dependable water control and protects other hydronic components from unnecessary stress. Verify compatibility by matching the full part number 8603-042 to your Bard model and parts list before ordering.