The BPV31-6 PACK SUPCO Bullet Piercing Valve is a versatile product designed for use with 1/4", 5/16", and 3/8" tubing. Manufactured by SUPCO, this hydraulic valve features a convenient 3-in-1 design that allows for easy installation and maintenance. The model number BPV31-6 indicates that this product is designed to meet the needs of businesses in the HVAC and refrigeration industry, providing reliable and efficient performance.