213813-1 is a replacement coupling ring designed for CPC Series 1 circular plastic connectors with shell size 13. The coupling ring is made from thermoplastic material with a UL 94V-0 flammability rating in black color. It is compatible with CPC connectors that accept Type III+, High-Current Power, Type II, and Subminiature Coax contacts. The connector system is designed to meet VDE requirements as shown in DIN Specification 57627 and is UL recognized for 600 VAC and 600 VDC service. This replacement part is ideal for maintaining or repairing existing CPC connector assemblies in commercial signal and power applications.