3-way splitter duct adapter with two adjustable valves — improves the efficiency and control of parking heater air distribution for cars and trucks. Key benefits Better heater performance: Diverts warm air where you need it to reduce heat loss and speed cabin warming. Precise airflow control: Two adjustable valves let you balance or shut off airflow to each branch independently. Flexible fit: T/Y shape design accepts a range of duct/channel sizes, making it easy to integrate into existing heater ductwork. Practical for professionals and owners: Useful for maintenance, upgrades, or custom installations on vehicles with parking heaters. What it does Splits a single heater outlet into two separate ducts while allowing independent adjustment of each branch. Matches the control of hot air distribution to occupants’ needs or priority zones (e.g., windshield vs. footwell). Compatibility and fit Designed for automotive parking heater systems for cars and trucks. T/Y shape adapter applies to different channel sizes so it can be used with common heater duct systems; installation is straightforward in most setups. Performance and construction Enables more efficient use of your parking heater by directing warm air where it’s most needed and minimizing wasted flow. Built for regular vehicle use and the demands of heater airflow; valves allow repeatable, manual control. Typical applications Passenger car: Split heater output between windshield defrost and footwell vents to reduce fogging and warm the cabin faster. Light commercial truck: Share warm air between driver’s cab and sleeper compartment or balance airflow across the cabin on cold starts. Workshop or service use: Quick retrofit when diagnosing heater distribution problems or when adding additional vents. What you get A T/Y shaped 3-way duct adapter with two adjustable valves compatible with parking heater duct systems. Simple, practical solution to improve comfort and heating efficiency without replacing the heater unit. Installation notes Intended for use with existing parking heater ductwork; verify duct diameters before installation to ensure a proper fit. Ideal for vehicle owners, installers, and maintenance professionals looking to optimize hot air distribution in cold weather.