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Your professional online source for butt connectors and butt splices for electrical wire. Red, blue and yellow PVC or Nylon insulated butt splice connectors are 600 Volt rated. Made in the USA. • Funnel ferrule wire entrance into electrical barrel eliminates wire strand ‘hang-up’, increases crimping rates and wire termination reliability.Insulated butt splices made of PVC and Nylon Material have an Operating Temperature Range: continuous duty from -67°F to 221°F (-55°C to 105°C).