Air tight? Was thinking about using this to cover flare fittings on a mini-split hvac for support.

Hi, Yes, our heat shrink tubing is air tight. If you have any other questions, please feel free to send us a direct message.

what size should i get to fit (3) 10AWG wires to make an extension cord ?

Depending on the type of wire and how thick the casing on the 10 gage wire. You might get away with 3/8 but I think it would be very tight, especially if long. So be safe and use 1/2 inch.. You will b fine. Look a the wire you are getting at its specs. It should tell you major dia. Add the 3 up. 2/3rds of you total will be bare minimum . But remeber if you make it to tight before shrinking. It will be hard to slide wire through.

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Heat shrink tubing roll - 4:1 ratio

Product ID: 432838204

Details

Brand
Wirefy
Item Thickness
6 millimeters
Material
Polyolefin
Product Dimensions
0.24"W
Recommended Uses For Product
electrical

📏4:1 shrink ratio for ultra-tight seal

🧰50 feet roll for multiple projects

🛡️Adhesive-lined for waterproof, dustproof protection

Description

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

BULK 50 FOOT ROLL - Enough tubing to power through multiple projects without running out—stay ahead of the game.
DUAL WALL DURABILITY - Outer abrasion-resistant layer plus inner adhesive wall for unbeatable strain relief and protection.
PRO GRADE VERSATILITY - Perfect 1/4" diameter tubing fits a wide range of wires—ideal for electricians and DIY pros alike.
BUILT IN ADHESIVE SEAL - Heat-activated glue locks out moisture and dust for long-lasting, corrosion-resistant connections.
PRECISION 4 1 SHRINK RATIO - Ensures a snug fit down to 1/4 original diameter—no loose ends, no compromises.

Wirefy’s 50-foot heat shrink tubing roll features a superior 4:1 shrink ratio that tightens to a quarter of its original size, creating a professional-grade seal. Its adhesive-lined dual-wall design ensures waterproof, dustproof, and abrasion-resistant insulation, making it an essential tool for electricians and DIY enthusiasts seeking durable, reliable wire protection.

Specifications

ASIN	B09NW8HZKV
Best Sellers Rank	#159,133 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #401 in Industrial Heat-Shrink Tubing #34,684 in Electrical Equipment
Brand Name	Wirefy
Customer Reviews	4.8 4.8 out of 5 stars (275)
Item Dimensions L x W	0.24"W
Item Length	600 inches
Item Thickness	6 millimeters
Manufacturer	Wirefy
Manufacturer Part Number	Wirefy-DW41-6-B
Material Type	Polyolefin
Model Number	Wirefy-DW41-6-B
Number of Items	1
Number of Packs	1
Recommended Uses For Product	electrical insulation, environmental seal, strain relief, thermal insulation, surface protection
UPC	850026973297
Unit Count	50 Feet

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