Kit Inserts IN-SP1-12 Insert for SP1 Sample Preparation Kit. 12 Samples. IN-SP1-60 Insert for SP1 Sample Preparation Kit. 60 Samples. IN-DF1 Insert for DF1 Dioxin/Furan Immunoassay Kit. PS-DF1 Summary of DF1 Dioxin/Furan Immunoassay Protocol