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

Product ID: 716713605

Details

Brand
Eventronic
Colour
Black
Indoor/outdoor use
Outdoor
Material
Polyvinyl
Style
Industrial

⚓marine-grade durability

🔥3:1 shrink ratio for precise fit

🛡️adhesive-lined for waterproof seal

176.21 DT

Duties & taxes included

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Eventronic
Colour
Black
Indoor/outdoor use
Outdoor

Description

🔥 Seal the deal with marine-grade precision!

ULTIMATE PROTECTION - Adhesive lining creates a watertight, corrosion-resistant seal
LIGHTWEIGHT COMPACT - Easy to store and carry with a sleek 322g kit design
PRECISION FIT EVERY TIME - 3:1 shrink ratio ensures snug, professional-grade insulation
VERSATILE KIT OF 400 PIECES - Comprehensive assortment covers all your electrical and industrial needs
BUILT FOR HARSH ENVIRONMENTS - Marine-grade tubing withstands saltwater and extreme conditions

The Eventronic 400 Pcs Heat Shrink Tubing Kit features a 3:1 shrink ratio and adhesive lining for a waterproof, corrosion-resistant seal. Designed to meet marine-grade standards, this lightweight and compact kit offers 400 versatile pieces ideal for professional electrical insulation and industrial applications.

Specifications

ASIN	B0BVVMCY86
Item model number	HST-400
Manufacturer	Eventronic
Product Dimensions	1 x 1 x 1 cm; 322 g

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