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640pcs Solder Seal Sleeve Heat Shrink Butt Crimp Connectors Terminals Waterproof Sale - Banggood...
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https://www.grote.com/electrical-connections/electrical-terminals-connectors/crimp-solder-seal-butt-connectors/83-2929/
83-2929 - Crimp Solder & Seal Butt Connectors, 22 - 18 Gauge
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https://www.partex.nu/crimp-terminals/insulated-crimp-terminals/heat-shrink-butt/cid,045
Heat shrink butt connector - Connectors - Crimp terminals | Partex
Butt connectors with thermal shrink insulation for connecting two wires.
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