Which plumbing fixtures in an RV control the flow of hot and cold water?

Faucets are the plumbing fixtures in an RV that control the flow of hot and cold water. They allow users to mix and adjust the temperature of the water by manipulating the handles or levers, directing the water to flow as needed for various tasks like washing hands, dishes, or showering. Faucets typically incorporate separate controls for hot and cold water, enabling precise temperature regulation.

Other fixtures like drains serve primarily to remove wastewater rather than control the incoming water flow. A pressure regulator is designed to manage the pressure of the water supply, ensuring it is at a safe level for the RV's plumbing system but does not control the temperature or flow directly. A fluid reducer, while it implies some function related to controlling fluid flow, is not a standard term associated with RV plumbing that specifically pertains to faucet operation. Therefore, faucets are the essential fixtures for controlling water temperature and flow in an RV.