NSPA OptiSeal Waterproof Crimp Step Down Butt Connectors, Yellow/Red, 12-10 to 8 AWG

Wire Gauge: Yellow/Red 12-10 to 8 AWG
Package Quantities: 10
Sale price$11.10


Opti-Seal OS56-10 - Crimp and Seal Step-Down Wire Connectors.  These are waterproof* heat shrink sealed electrical connectors.  These are RoHS compliant and made in the USA.  There simply is no better product made. 

  • Color: Crystal Clear with Yellow/Red wire size strip marker
  • Wire Size: 12-10 AWG to 8 AWG
  • Product Name: SES Opti-Seal, Heat Shrink Crimp Step Down Connectors
  • Type: Window with Wire Stop, Crimp and Seal with Adhesive-Lined Heat Shrink Tubing
  • Seam Type: Seamless
  • Part #: OS56-10 (Yellow / Red; 12-10 AWG to 8 AWG)


  1. Strip both wires, wire length 5/16" (8mm)
  2. Insert wire into barrel 
  3. Crimp wire to barrel 
  4. Heat tubing 

For best results: Use heat device of at least 1000°F/538°C. Don’t overheat tubing. Don’t isolate flame. Distribute heat evenly over tubing. 

NOTE : Crimping tool and Heat Source to reduce tubing and seal connector needed.  Butane Torch and Ratcheting Crimp tool recommended.  Questions, please ask.

* There is no official UL Standard for 'waterproof' electrical connectors. Connectors would most likely fall in the IP67 range (IP - Ingress Protection, 6 - Totally protected against dust, 7 - Protected against the effects of temporary immersion between 15cm and 1m. Duration of test 30 minutes)

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