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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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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: 709153362

Details

Brand
Wirefy
Item Thickness
0.38 Inches
Material
Polyolefin
Product Dimensions
25L x 6.5W
Recommended Uses For Product
thermal

💧Adhesive-lined for waterproof insulation

📏3:1 shrink ratio for tight seals

🛡️Dual-wall, industrial-grade durability

Description

🔥 Seal it tight, seal it right — the pro’s choice for lasting connections!

EASY HEAT APPLICATION - Slide on, apply heat, and achieve flawless insulation in seconds—no fuss, no mess.
GENEROUS 50 FOOT ROLL - Ample length to power through multiple projects without constant reordering.
PRECISION 3 1 SHRINK RATIO - Ensures a snug, professional-grade seal that outperforms standard 2:1 tubing.
BUILT IN WATERPROOF ADHESIVE - Activates with heat to lock out moisture and protect your connections long-term.
DUAL WALL INDUSTRIAL STRENGTH - Resists heat, fluids, and mechanical stress for rugged, reliable insulation.

Wirefy’s 3/8" Heat Shrink Tubing features a superior 3:1 shrink ratio and adhesive-lined dual-wall construction, delivering waterproof, durable insulation ideal for marine and industrial applications. With 50 feet per roll and easy heat activation, it’s engineered for professionals demanding reliable, long-lasting electrical protection.

Specifications

ASIN	B08W9BRKZQ
Brand Name	Wirefy
Customer Reviews	4.8 4.8 out of 5 stars (2,284)
Item Dimensions L x W	25L x 6.5W Centimeters
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	thermal insulation
UPC	850026973037
Unit Count	50 Feet

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The product exactly matches the description. Very satisfied with my purchase.

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