How is this sleeve measured? Are the listed sizes diameters or are they the measurements of the sleeve when layed flat?

Actually, the perimeter of a 3/4" diameter pipe is 2-3/8".

Will the 1.5 inch sleeve fit over a 1.5 inch radiator hose, or will it be too snug?

if the radiator hose is truly a 1.5" o.d and straight then yes it will fit, but if the hose expands as rubber does, then it will be greater than 1.5" and it may split the sleeve, If it is a curved hose then it will be greater than 1.5" o.d. in portions and the sleeve will not fit. You would not want to put this on a radiator hose as it would trap heat and not allow the radiator hose to radiate and dissipate heat properly. If the hose is not carrying hot water but merely used as a drain hose, then this is fine. This it meant to protect from radiant heat but also retains heat internally which could cause your rubber hose to fail prematurely and due to being obscured by the wrap you could not inspect the hose for sponginess, cracking or impending failure. Basically, not a good idea for that purpose.

What is the inside diameter

The product is in a roll. The diameter is what ever you make it.

Can this be used on the egr valve tube

Yes, the Design Engineering 010418 Heat Sheath can be used on the EGR valve tube. The inner diameter of the heat sheath is 0.5 inches, which is larger than the inner diameter of most EGR valve tubes (typically 0.4 inches). This means that the heat sheath will fit snugly over the EGR valve tube and provide protection from heat.

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DEI Heat Sheath Aluminized Heat Sleeve 1/2" ID x 3 ft Heat Protection

DEI Heat Sheath Aluminized Heat Sleeve 1/2" ID x 3 ft Heat Protection

Product ID: 10457946

Details

Brand
Design
Global Trade Identification Number
Item Thickness
0.5 Inches
Material
Aluminum
Recommended Uses For Product
Thermal

🔥Reflects radiant heat up to 2000°F

⚙️Easy slip-on installation, no tools needed

🛡️Heavy-duty abrasion & chemical resistance

10.72 OMR

Duties & taxes included

In stock

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Description

🔥 Stay cool under pressure with DEI Heat Sheath – the ultimate heat armor for your ride!

BUILT TO LAST - Constructed with 19 oz high-temp fiberglass and durable aluminum for unmatched abrasion and fire resistance.
TRUSTED PERFORMANCE - Top-rated with 4.7 stars and a bestseller in automotive heat protection—join the pros who rely on it.
ULTIMATE HEAT DEFENSE - Reflects intense radiant heat up to 2000°F, keeping your components cooler and safer.
EFFORTLESS INSTALLATION - Slip-on design means no special tools or hassle—cut to length and install in minutes.
CHEMICAL DEBRIS SHIELD - Protects hoses and cables from oil, fuel, chemicals, dirt, and road grime in harsh environments.

The DEI Heat Sheath Aluminized Heat Sleeve offers premium protection for hoses, wires, and cables exposed to extreme heat and abrasion. Featuring a 19 oz fiberglass insulation core bonded to a reflective aluminum outer layer, it reflects radiant heat up to 2000°F and withstands direct heat up to 500°F. Resistant to oil, chemicals, and debris, it ensures long-lasting durability in automotive and industrial settings. Easy to install with a slip-on design, this USA-made sleeve is a top-rated solution trusted by professionals for thermal and abrasion protection.

Specifications

ASIN	B000CEM3M2
Best Sellers Rank	#4,882 in Automotive ( See Top 100 in Automotive ) #7 in Automotive Replacement Exhaust Heat Wrap, Matting & Sleeving
Brand Name	Design Engineering
Coverage	3 feet linear coverage
Customer Reviews	4.7 4.7 out of 5 stars (1,205)
Global Trade Identification Number	00607078104182
Included Components	Design Engineering Heat Sheath Aluminized Sleeving 1/2" X 36" Line And Hose Protection - Sewn
Item Thickness	0.5 Inches
Item Type Name	Aluminized Sleeving for Ultimate Hi-Temp Protection
Item Weight	0.18 Pounds
Manufacturer	Design Engineering
Manufacturer Part Number	10418
Manufacturer Warranty Description	Not applicbale
Material Type	Aluminum
Model Number	10418
Recommended Uses For Product	Thermal Insulation, Abrasion Protection, Chemical Resistance
UPC	607078104182
Unit Count	1.0 Count

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