The DUTUX Brass Access NRV Charging Valve Nipple (021-NRVCVN) is a precision-engineered component used for refrigerant charging, servicing, and pressure control in HVAC systems. Made from premium brass/copper alloy, it offers excellent durability, corrosion resistance, and reliable performance. It features an internal non-return valve (NRV) that prevents backflow while allowing easy charging and maintenance. The integrated copper tube enables convenient installation in refrigeration pipelines. Manufactured with advanced machining and strict quality control, it ensures precise threading, leak-proof sealing, high accuracy, and long service life.