The Apollo 1/2 inch Brass PEX-B Coupling Pro Pack includes 38 pieces of crimp fitting designed for PEX pipes. These couplings have a maximum working pressure of 200 psi and a maximum working temperature of 200 degrees Fahrenheit. Made of durable brass material, they are suitable for potable water applications. The pack size is 40, and each fitting is 1/2 inch in size with a double fitting size of 1/2" x 1/2". The Apollo brand is known for quality fittings, making this product a reliable choice for plumbing projects.