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 Heat Shrink - Black - 50 Feet Roll

Product ID: 304108804

Details

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

📏3:1 shrink ratio for ultra-tight fit

🔧275 precut pieces in 7 sizes

🛡️Adhesive-lined waterproof seal

Description

🔥 Seal it tight, protect it right! 🛠️

DUAL LAYER DURABILITY - Outer abrasion-resistant wall plus inner adhesive layer deliver long-lasting protection and strain relief.
READY FOR ANY PROJECT - 275 precut tubes in 7 versatile sizes cover all your wiring needs without the hassle of cutting.
PRECISION FIT EVERY TIME - 3:1 shrink ratio ensures a snug, professional-grade seal that outperforms standard 2:1 tubing.
BUILT IN WATERPROOF ARMOR - Adhesive lining melts to create a durable, moisture-resistant barrier—perfect for outdoor and industrial use.
EFFORTLESS PROFESSIONAL RESULTS - Slide on, heat, and seal in seconds—no expert skills required, just flawless connections every time.

The Wirefy Heat Shrink Tubing Kit offers 275 precut polyolefin tubes with a superior 3:1 shrink ratio and adhesive lining for waterproof, abrasion-resistant insulation. Featuring seven common sizes and dual-wall construction, it delivers professional-grade wire protection and strain relief with easy application—trusted by thousands and UL certified for industrial reliability.

Specifications

ASIN	B08W9BRKZQ
Best Sellers Rank	#25,653 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #90 in Industrial Heat-Shrink Tubing #15,873 in Electrical Equipment
Brand Name	Wirefy
Customer Reviews	4.7 4.7 out of 5 stars (33,163)
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 Type	Polyolefin
Model Number	Wirefy-DWT-9.5-B
Number of Items	1
Number of Packs	1
Recommended Uses For Product	Electrical Insulation, Automotive Applications, Outdoor/Harsh Environments
UPC	850026973037
Unit Count	50 Feet

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