This listing contains 400 pieces of model 1749221, 4Hole Rectangular Connector Shell Plugs. These plugs are designed to fill and seal unused cavities in rectangular connector shells, helping to keep assemblies clean, protected, and reliable. Key benefits Seals unused cavities to protect against dust, moisture, and debris Maintains electrical insulation and mechanical integrity of the connector Simple, tool installation for standard rectangular connector shells Bulk pack of 400 pieces supports volume applications and reduces replacement costs Key attributes Model/Part: 1749221 Type: 4Hole Rectangular Connector Shell Plugs Configuration: 4hole Pack quantity: 400 pieces per pack Compatibility: designed for use with rectangular connector shells that accept 1749221 plugs Material: not specified in listing Functionality: plug and seal unused cavities in rectangular connector shells Performance: intended for reliable closure in typical operating environments Applications and use cases Automotive wiring harnesses: seal unused positions in 4hole rectangular connector shells to prevent contamination and ensure reliable performance. Electronics enclosures and control panels: close unused cavities in harness connectors to protect internal components from dust and moisture. Industrial robotics and machinery: secure unused channels in connector assemblies, improving durability and reducing the risk of short circuits or debris ingress.