K Series copper tubing plugs are especially suitable for general purpose, Type K copper tubing, SAE standard j-528. This Series is designed for applications where the outside diameter of the closure should not exceed the outside diameter of the tubing. The flanges fit flush with outer walls of tubing, providing positive protection against moisture and dirt.:: a: 0.160, b: 0.202, C: 0.24, D: 0.14, E: 0.38, F: 0.14, saej-528in: 1/4.