The product is a lot of 5 Apollo Coupler Adapter Polybutylene fittings with a maximum pressure rating of 200 psi. These fittings are designed for use with 1/2" PEX tubing, specifically marked with manufacturer part number 277-486. They are commonly used in plumbing applications to connect PEX tubing securely and efficiently. The Apollo brand is known for its quality and reliability in the hydraulics, pneumatics, pumps, and plumbing industry.