3/8-16 UNC, Zinc Plated, Steel Standard Wing Nut MPN:0-EF-805E87-

The Push-to-connect tube fitting connector has a 1/2 inch outside diameter, providing users with an easy way to join various types of tubes without the need for any soldering, threading or gluing. It is commonly used in automotive, mechanical and industrial applications that require flexible and secure connections between tubing systems.