Anderson Metals 3/8 In. Brass Compression Insert, 5-Pack is an essential component designed to work with compression fittings on nylon and plastic hoses. This brass compression insert reinforces and strengthens the hose when tightening the compression fitting, ensuring a secure and leak-resistant connection. Specifically made for use with nylon or polyethylene hoses, it is inserted into the hose before attaching the compression fitting to provide added stability and durability at the connection point. By preventing the hose from collapsing or deforming under pressure, this insert s a reliable and long-lasting connection for your plumbing needs. Model Number: 30561-06