The 100P237-13-1-B-NB6-02 is a plug protection cap assembly designed for MIL-DTL-38999 Series III plugs. This cap features shell size 13 with a maximum outer diameter (ØA) of 28.0 mm and an internal thread (B) of 0.875-0.1P-0.3L-TS, with a minimum inner diameter (ØC) of 19.4 mm. The cap is constructed from stainless steel (material code 4) with a cadmium olive drab finish over electroless nickel (finish code B), and includes an olive drab nylon cord lanyard (lanyard type NB) with a 6-inch length. The design incorporates a fluorosilicone gasket option and supports various attachment configurations including eyelet, ring, split ring, crimp ferrule, and tie-wrap options. This protection cap is commonly used in military and aerospace applications to protect connector plugs from environmental contamination and damage during storage and transport.