The SPT Series side pull-tab plugs were designed for quick and easy removal. These shallow plugs with small flanges are ideal for plugging open ports in areas with limited space. The pull-tab is molded with a small bead to enable easy gripping and removal. These plugs are color coded for your convenience. : : A: 0.546, B: 0.64, C: 0.78, D: 0.28, TOFITTHRSZ: 3/8-18 NPT.