The Apollo Valves APXBC12125PK Poly B x PEX Coupling is a brass fitting designed for connecting 1/2 inch polybutylene (Poly B) pipe to 1/2 inch PEX tubing. The coupling comes in a convenient bag of 5 units and is suitable for use in plumbing applications. Manufactured in China, this Apollo Valves product is made of high-quality brass and copper materials, ensuring durability and reliability in connecting different types of pipes.