The Emerson Flow Control (Alco) 066432 BTAS 4 Seal Ring Kit is a replacement sealing kit designed to restore leak-tight performance in compatible refrigeration and HVAC flow control components. It includes precision-engineered seal rings that create secure seals between connected parts, preventing refrigerant leakage while maintaining proper system pressure and efficiency. Commonly us... https://www.partshnc.com/066432-emerson-flow-control-alco-btas-4-seal-ring-kit