Is the diameter on each tube the original size (pre-shrinking)?

Yes.Size is before shrinking,3/32 shrinks to 0.8mm. 1/8 shrinks to 1.1mm. 3/16 shrinks to 1.6mm. 1/4 shrinks to 2.1mm. 3/8 shrinks to 3.2mm. 1/2 shrinks to 4.2mm. 3/4 shrinks to 6.0mm

Can this be used to join two tubes together? Does the glue just seal the ends or the entire tube?

If the tubes and the heat shrink tubes fit snugly after heating them I'm sure it would work well. This is very durable heat shrink, thicker than most. Keep in mind also, it's 3:1 shrink. Glue throughout the tubing.

What is the max temperature on these heat shrink tubes? Can I put it in the car engine bay?

Operating temperature: -55℃～125℃.They can be used in an engine bay.

Our heat shrink tubing kits are produced in China,but I can say after using these on a number of projects and boat rewiring they don't leak or seem to be affected by oil/gas/saltwater,and they've held up over time which is all that matters.

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400 Pcs Heat Shrink Tubing Kit-3:1 Ratio Adhesive Lined,Marine Grade Shrink Wrap - Industrial Heat-Shrink Tubing - Black

Product ID: 525565087

Details

Brand
Eventronic
Color
Black
Installation Type
Self-Adhesive
Material
polyolefin
Style
Heat Shrink

💧Adhesive-lined waterproof seal

🔥3:1 shrink ratio for tight seals

🛠️7 versatile pre-cut sizes

€ 40.37

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Seal your connections like a pro — no leaks, no limits!

BUILT TO LAST - Dual-wall construction offers superior abrasion resistance and strain relief, protecting your connections in any environment.
SHRINK LIKE A PRO - 3:1 ratio shrinks tubing to a third of its size for a flawless, professional-grade seal every time.
READY FOR ANY PROJECT - Includes 7 of the most popular diameters, pre-cut to 1.77 inches, so you’re always prepared for precise, clean installations.
SEAL IT TIGHT SEAL IT RIGHT - Adhesive lining activates with heat, creating a durable, waterproof barrier that stands up to marine and industrial challenges.
VERSATILITY MEETS RELIABILITY - Perfect for automotive, marine, DIY, and industrial wiring—protects against moisture, chemicals, abrasion, and more.

The Eventronic 400 Pcs Heat Shrink Tubing Kit features a powerful 3:1 shrink ratio with fast contraction speed, ensuring tight, professional seals. Its adhesive-lined dual-wall tubing provides waterproof, abrasion-resistant protection ideal for marine, automotive, and industrial applications. With 7 pre-cut sizes included, this kit offers versatile, reliable insulation and strain relief for all your wiring projects.

Specifications

ASIN	B0BVVMCY86
Best Sellers Rank	#440 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Industrial Heat-Shrink Tubing
Brand	Eventronic
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (33,604)
Enclosure Material	polyolefin
Indoor Outdoor Usage	Outdoor
Installation Type	Self-Adhesive
Manufacturer	Eventronic
Mfr Part Number	HST-400
Model Number	HST-400
Number of Pieces	400
Style Name	Heat Shrink Tubing
Unit Count	400.0 Count
Warranty Description	No

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