Extreme Crimp N Seal terminals were the original heat shrinkable connectors. They combine the protection of a nylon insulated connector with the waterproof seal of polyolefin heat shrinkable tubing.
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The nylon connector provides superior abrasion resistance and eliminates punctures during installation. The clear heat shrinkable tubing with a melt able inner-wall is installed over the nylon insulation providing the toughest, waterproof electrical connection available.
The dual protection of nylon insulation and heat shrinkable tubing makes the Crimp 'N Seal Extreme a great option for harsh On-highway and Off-road heavy equipment applications.
Standard Crimp N Seals terminals came out later, after much experience with the original Crimp N Seals. They start with a non-insulated terminal and utilize lower profile polyolefin heat shrinkable tubing which is colorized to denote the wire gauge. (The Extreme Seals use the color of the Nylon insulation).
So:
- The standard Crimp N Seals are bare terminals insulated with a colored dual wall heat shrink tubing.
- The Extreme Crimp N Seals are nylon insulated terminals with a H.D. clear heat shrink tubing over the nylon insulation.
The choice is really more a matter of taste.