The 10-101960-20FL is a wall-mounted receptacle protection cap designed for Amphenol PT series miniature cylindrical connectors with bayonet coupling and solder contacts. This cap is specifically engineered for shell size 20 connectors and features a gray zinc nickel finish (FL designation). The cap has a bore diameter (B) of 1.219 inches and an outer diameter (C) of 1.391 inches, with a maximum length (L) of 0.563 inches, providing secure protection against dust, moisture, and contamination when connectors are not in use. It is supplied with a standard bead chain attachment for convenient handling and storage. This protection cap is essential for maintaining connector integrity in harsh environments and is commonly used in aerospace, military, and industrial applications where connector reliability is critical.