The Power Products 3/8" Brass Close Nipple is the perfect solution for any air brake system that uses copper tubing. It is designed to provide a secure connection without the need for any specific tubing setup. This close nipple is made of durable brass and can withstand temperatures ranging from -65 ° to +250 °F. It also has a maximum working pressure of 401 psi and decent resistance against vibration. FleetPride is your First Click in Heavy Duty®.