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

Wirefy 3/8" Heat Shrink Tubing - 3:1 Ratio - Adhesive Lined - Marine Grade Heat Shrink - Black - 50 Feet Roll

Product ID: 386344254

Details

Brand
Wirefy
Colour
Black
Item weight
499 g
Material
Polyolefin
Product dimensions
25L x 6.5W

💧Adhesive-lined for waterproof insulation

📏3:1 shrink ratio for tight seal

🛡️Dual-wall industrial-grade durability

56885CFA

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Description

🔥 Seal it tight, seal it right — pro-grade heat shrink for the savvy maker!

GENEROUS 50 FOOT ROLL - Ample length to power through multiple projects without constant reordering.
WATERPROOF CONFIDENCE - Built-in adhesive activates with heat to lock out moisture and protect your connections long-term.
EFFORTLESS APPLICATION - Slide on, apply heat, and achieve flawless insulation in seconds—no fuss, no mess.
PRECISION FIT EVERY TIME - 3:1 shrink ratio ensures a snug, professional seal that outperforms standard 2:1 tubing.
RUGGED DUAL WALL PROTECTION - Marine-grade polyolefin resists fluids, heat, and mechanical stress for lasting reliability.

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. This 50-foot roll of black polyolefin tubing offers professional-grade protection against heat, fluids, and mechanical wear, making it a must-have for precise, long-lasting electrical connections.

Specifications

ASIN	B08W9BRKZQ
Brand	Wirefy
Brand Name	Wirefy
Customer Reviews	4.7 out of 5 stars 2,964 Reviews
Item Dimensions L x W	25L x 6.5W centimeters
Item Length	600 Inches
Item Thickness	0.38 Inches
Item Weight	499 g
Item thickness	0.38 Inches
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	25L x 6.5W centimeters
Recommended Uses For Product	thermal insulation
Recommended uses for product	thermal insulation
UPC	850026973037
Unit Count	50 Feet

Reviews

C**R

Durable but ... 1) Shrinks slowly 2) Maybe not quite 3:1

It's Ok. It takes a long time to shrink to its minimum size. It's thick material and the glue has to heat-up. I'm not sure that it shrinks down from 3:1. It seems to come-up a little bit short on that. Your results may vary.

14.03.2023

P**N

Good product

Good heat shrink tube. Finely packed. Works as it should do.

22.05.2026

S**L

Très bon produit, conforme.

25.11.2025

P**B

high quality and seals great!

This shrink tube is all i will ever order for my maintenance shop. We love this stuff!

10.06.2026

C**N

Queda perfecto

Queda perfecto para cable de 16mm, 7,1 de diámetro

1.04.2025

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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56885CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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5 days ago

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