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Silicone Rubber Blue Coolant Hose, 1.39 Inch OD, 1.00 Inch ID, 36 Inch Long

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Description & Features

The FLEXFAB silicone rubber blue coolant hose is engineered to meet stringent industry standards ensuring reliable performance in demanding environments.

Constructed with 4-ply silicone reinforcement and polyester fabric this hose is designed to handle a continuous operating temperature range from -65deg;F to 350deg;F. The silicone elastomer coating enhances durability and longevity aligning with SAE J20 R1 Class A and TMC RP303B Class 1 Grade 1 specifications.

This 36-inch long hose with a 1-inch inner diameter and 1.39-inch outer diameter is suitable for applications in refrigeration air conditioning pressure washers and hydraulic brake systems. It is built to withstand a burst pressure of 550 psi.

Ideal for both OEM truck manufacturers and aftermarket solutions this coolant hose offers exceptional flexibility and strength making it a reliable choice for various industrial applications.

Supplier Part Number: 5581-100

Specifications

Color
Blue
Hose Color
Blue
Hose Type
Auto/Truck Coolant Hose
Inside Diameter
1 in
Nominal Size
1 in
Reinforcement
4-Ply Polyester
Resistance Properties
Aging, Cold Leak, Crack, Hardening, Oil Splash, Ozone, Temperature
Series
5581 Series
Tube Material
Silicone

Product Questions & Answers (3)

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Question by: Kent H on Feb 28, 2026, 6:07 AM
What kinda pressure can this hose handle before it busts?
Answer by: Customer Support on Mar 2, 2026, 6:02 AM
This hose is built to withstand a burst pressure of 550 psi, giving you a good safety margin in most applications.
Question by: Jimmy W on Dec 3, 2025, 6:17 PM
got a 1 inch coolant line i need to replace. is this hose actually 1" on the inside and 36" long?
Answer by: Customer Support on Dec 5, 2025, 6:28 AM
It is a 1.00 inch ID hose with a 1.39 inch OD, and it comes in a 36 inch length.
Question by: Johnny C on Jan 13, 2026, 6:25 AM
What's the temp range on this hose? Running coolant lines on a fleet truck and we see everything from hard freezes in winter to sitting in the sun all summer long.
Answer by: Customer Support on Jan 15, 2026, 6:35 AM
Continuous operating range runs from -65°F up to 350°F, so it handles both deep cold and high under-hood heat without issue. Four-ply silicone construction with polyester reinforcement keeps it from going soft or cracking at either extreme. For fleet work across variable seasons, that range covers just about anything you'd run into.

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