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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Wirefy 1/4" Heat Shrink Tubing - 4:1 Ratio - Adhesive Lined - Marine Grade Heat Shrink - 50 Feet Roll - Black

Wirefy 1/4" Heat Shrink Tubing - 4:1 Ratio - Adhesive Lined - Marine Grade Heat Shrink - 50 Feet Roll - Black

Product ID: 431179810

Details

Brand
Wirefy
Colour
Black
Material
Polyolefin
Maximum pressure
10 Bars
Product dimensions
15.24L x 0.01W

⚡600V rated marine-grade insulation

📏4:1 shrink ratio for ultra-tight fit

🛡️Adhesive-lined for waterproof, durable seal

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Description

🔥 Seal it tight, shine professional ⚡

DUAL WALL PROTECTION - Outer abrasion-resistant layer plus inner adhesive barrier deliver unmatched strain relief and waterproofing.
GENEROUS 50 FOOT ROLL - Ample length to power through multiple projects—never run short when precision matters most.
BUILT IN ADHESIVE SEAL - Heat activates a strong glue lining that locks out moisture and ensures long-lasting protection.
MARINE GRADE DURABILITY - Certified UL and rated for 600 volts, perfect for harsh environments and critical electrical projects.
PRECISION 4 1 SHRINK RATIO - Achieve a snug, professional seal that outperforms standard 3:1 tubing every time.

Wirefy's 1/4" heat shrink tubing features a superior 4:1 shrink ratio and adhesive lining for a waterproof, durable seal. Marine-grade and UL certified, this 50-foot black polyolefin roll offers dual-wall protection and 600V insulation, making it the go-to choice for professionals demanding reliable, long-lasting electrical connections.

Specifications

ASIN	B09NW8HZKV
ASIN	B09NW8HZKV
Brand Name	Wirefy
Color	Black
Customer Reviews	4.8 4.8 out of 5 stars (483)
Customer reviews	4.8 4.8 out of 5 stars (483)
Date First Available	10 April 2022
Item Dimensions L x W	15.24L x 0.01W Meters
Item Length	600 Inches
Item model number	Wirefy-DW41-6-B
Manufacturer	Wirefy
Manufacturer	Wirefy
Material Type	Polyolefin
Maximum Pressure	10 Bars
Nominal Wall Thickness	EO 0.5 millimeters
Outside Diameter	6 Millimeters
Product Dimensions	19 x 6.5 x 19 cm; 280 g
UPC	850026973297
Unit Count	15.24 Meters

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