The Bullet Piercing Valves BPV-21 is a metal control valve designed for HVAC and refrigeration systems. Manufactured by Sealed Unit Parts Co., this piercing valve is used for tapping into A/C and refrigeration lines. Made in China, this model is known for its durability and reliability in controlling the flow of refrigerants in various industrial and commercial applications. The bullet piercing valve is a crucial component in maintaining and repairing HVAC and refrigeration systems efficiently.