do i really need to heat shrink if the wires will be inside my vehicle? it would not be exposed outside so corrosion should not be a problem

You can do whatever you feel works for you really. I have. And have learned a few times starting with electrical tape (failed with the slightest pull and disconnected). Then crimp connectors (no good due to either over crimping or under crimping). Then heat shrink tubing with solder rings in the tube (works but when fails. It reduces the wire length cutting off connector if needed. Time and money involved. Best way is cordless solder gun. Solder the wires and slide tubing over and heat shrink. To make it secure and moisture proof. Condensation has a way of forming in the oddest places.

I don't have a heat gun. Do these need a heat gun to be effective?

They work just fine if not shrunk down to the wire. You can can use a flame but is a little difficult. Just get a cheap heat gun, , much easier and better.

will a hair dryer work as a heat source for shrinking the plastic sleeve?

I have not tried a hair dryer. Keep in mind that it requires a hot air to melt and shrink the connectors. I don’t think a hairdryer will not be hot enough to seal the connectors.

Would these work with electric sidewalk lighting?

I would say yes. I used them on a boat motor.

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Description

🔥 Seal it, shrink it, secure it — the pro’s choice for flawless connections! 🔧

HEAT SHRINK PRECISION - 3:1 shrink ratio activates at 80℃ and fully seals by 130℃ for a snug, durable fit without length loss.
VISUAL CONFIDENCE CHECK - Translucent tubing lets you inspect crimps instantly, guaranteeing secure and reliable wire joints every time.
PERFECTLY SIZED FOR EVERY JOB - 210 color-coded connectors tailored to your DIY needs—never run out of the right size again.
ULTIMATE WATERPROOF PROTECTION - Polyolefin adhesive-lined tubing seals out moisture and air, ensuring long-lasting, corrosion-free connections.
BUILT TO ENDURE EXTREME CONDITIONS - Rated from -55℃ to 125℃ and UL 94 V-0 certified for marine, automotive, and industrial-grade durability.

The Kuject 210PCS Heat Shrink Butt Connectors kit offers a comprehensive, color-coded selection of tinned copper, waterproof crimp connectors with a 3:1 shrink ratio. Designed for marine, automotive, and stereo wiring, these UL-certified connectors provide superior pull strength, corrosion resistance, and visual inspection ease, operating reliably between -55℃ and 125℃.

Specifications

Colour	Multicolored
Connector Type	Butt Splice, Crimp
Contact Material	Copper
Insulation Material	Polyolefin
Terminal	marine
Material	Copper
Brand	Kuject
Specification Met	UL 94 V-0
Temperature Rating	125 degree celsius
Product Dimensions	25.3L x 18W x 1.6H Centimeters
Maximum Voltage	1.2E+2 Volts
Net Quantity	210 Count
Manufacturer	uxcell
Model	CC270
Item model number	CC270
Special Features	High quality and durability, Insulated and waterproof
Number of items	210
Voltage	12 Volts
Power Source	ac
Batteries Included	No
Batteries Required	No
Includes Rechargeable Battery	No
Country of Origin	USA
Item Weight	340 g

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