TE Connectivity Closed End Splices. Closed end splices available with nylon or vinyl insulation that accept a combination of solid and stranded wires for single and multiple applications. These insulated closed end splices are made from copper with a tin finish. For wire size, colour, opening diameter and insulation material please see additional data table. A hand crimping tool is available for crimping size 22-14 AWG splices, please see stock number ; 431-8901 431-8901. Wire range 22-14 awg UL ; CSA approved Robust, high quality splice tool Stock no. ; 431-8901 431-8901 available