Does this start off as 1/2inch then shink down

Yes it does. I have 1/4'', 3/8'', & 1/2'' and they all measure at least their diameter before shrinking. I won't use anything but Wirefy tubing! I like the 3:1 best for my uses.

what is the operating temperature rating?

From my use it appears to have an operating temperature of between 600F and 900F. Unless the tubing is physically contacting a heat source I would say its save to use at near 1000F. Within 1/8" from a industrial soldering iron that idles at 980F It is safe. It may over-harden if exposed to this level of heat for a length of time (Over 30 min.) Contact heat will burn this at even a low temp.( i.e. laying across an engine's exhaust manifold. It would would work well in nearly any engine compartment. Hope this helps. For short runs this stuff is tough.

Will it work on 14awg wire?

Yes, 3/16" heat shrink tubing will work on 14AWG wire.

Is this heat shrink resistant to gasoline?

It is resistant to gasoline. However, we do not recommend to leave it submerged in gasoline.

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Wirefy 3/8" Heat Shrink Tubing - 3:1 Ratio - Adhesive Lined - Marine Grade He...

Wirefy 3/8" Heat Shrink Tubing - 3:1 Ratio - Adhesive Lined - Marine Grade He...

Product ID: 304108804

Details

Brand
Wirefy
Item Thickness
0.38 Inches
Material
Polyolefin
Product Dimensions
9.84"L x
Recommended Uses For Product
Electrical

💧Adhesive dual-wall waterproof seal

📏3:1 shrink ratio for precision fit

🛠️50ft flexible roll for custom cuts

€ 88.97

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Shrink it, seal it, secure it — the pro’s choice for flawless wiring! 🛡️

PRECISION FIT EVERY TIME - 3:1 shrink ratio ensures a snug, professional-grade seal that outperforms standard 2:1 tubing.
CUSTOM LENGTHS ZERO WASTE - Generous 50-foot roll lets you cut exactly what you need, eliminating the hassle of pre-cut kits.
CERTIFIED SAFETY YOU CAN TRUST - UL-listed for flame resistance and electrical insulation, meeting rigorous industry standards for peace of mind.
BUILT TO WITHSTAND HARSH CONDITIONS - Durable polyolefin material resists abrasion, heat, and oil, ensuring long-lasting insulation in demanding environments.
ULTIMATE PROTECTION AGAINST ELEMENTS - Adhesive-lined dual-wall design creates a waterproof and oil-proof barrier, perfect for marine and automotive use.

Wirefy Heat Shrink Tubing offers a superior 3:1 shrink ratio on a 50-foot roll of durable, adhesive dual-wall polyolefin tubing. Waterproof, oil-proof, and UL-certified, it delivers reliable insulation and protection for electrical, automotive, and outdoor applications, making it the trusted solution for professionals demanding precision and durability.

Specifications

ASIN	B08W9BRKZQ
Best Sellers Rank	#1,318 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Industrial Heat-Shrink Tubing #1,148 in Electrical Equipment
Brand	Wirefy
Brand Name	Wirefy
Customer Reviews	4.7 out of 5 stars 33,054 Reviews
Item Dimensions L x W	9.84"L x 2.56"W
Item Length	600 Inches
Item Thickness	0.38 Inches
Item Weight	1.1 Pounds
Manufacturer	Wirefy
Manufacturer Part Number	Wirefy-DWT-9.5-B
Material	Polyolefin
Material Type	Polyolefin
Model Number	Wirefy-DWT-9.5-B
Number of Packs	1
Product Dimensions	9.84"L x 2.56"W
Recommended Uses For Product	Electrical Insulation, Automotive Applications, Outdoor/Harsh Environments
UPC	850026973037
Unit Count	50 Feet

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Smooth transaction and product arrived in perfect condition.

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