The 2000T CU series connectors, like all 2000T CU series connectors are designed for use with 3M splice kits, CS500 series, 3M Scotchlok 2000T CU series, 3M Scotchlok Splice Kits 2000-3T series and 5700 series. These connectors have a solid center oil stop and meet ANSI Standard C-119.4.