The York S1-1TVM4H1 (4518) Expansion Valve/TXV Kit is a genuine OEM thermostatic expansion valve designed for use with R410A refrigerant systems. Built for precise refrigerant metering and superheat control, this 4-ton TXV optimizes system efficiency and performance under varying load conditions. The valve includes a 30-inch capillary tube and 5/8" x 5/8" connections, providing a perfect fit for York air conditioning and heat pump units. Key Features: Genuine York OEM TXV Kit for superior refrigerant flow control. Designed for R410A refrigerant systems. Supports 4-ton capacity cooling applications. Includes 30" capillary tube for flexible installation. Maintains consistent superheat for improved efficiency. Durable brass and stainless steel construction ensures long-term reliability. Specifications: Part Numbers: S1-1TVM4H1 / 4518 Type: Thermostatic Expansion Valve (TXV) Refrigerant: R410A Capacity: 4 Ton Inlet Connection: 5/8" Outlet Connection: 5/8" Capillary Length: 30 inches Application: Air Conditioning / Heat Pump Systems Manufacturer: York (Johnson Controls) Compatible Models: AHP48D4HH21, ACP048C1021, AHP42C4HH21, AHP30B4HH21, AHP36C4HH21, MC42C4HH1, FC60D4HN1, MC60D4HH1, FC35B4HN1, MC35B4HH1, LL8S100B16UH11, EB15C, F3FP048H06T, FC48D4HN1, MC48D4HH1, F3RP042H06T, RSH024A6MLSAB0A, and more. Why Choose This Item: The York S1-1TVM4H1 Expansion Valve Kit ensures precise refrigerant control and optimal system efficiency in 4-ton R410A systems. As a genuine OEM component, it offers factory-level performance, reliable operation, and long-lasting durability ? making it the trusted choice for maintaining your HVAC system?s cooling precision and overall performance.