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Silicone Rubber Blue Coolant Hose, 3.14 Inch OD, 2.75 Inch ID, 36 Inch Long

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Description & Features

The FLEXFAB Silicone Rubber Blue Coolant Hose is engineered to meet or exceed the rigorous specifications of SAE J20 R1 Class A TMC RP303B Class 1 Grade 1. It also aligns with the requirements of most OEM truck manufacturers' standards making it a dependable choice for specialized applications in refrigeration air conditioning and hydraulic brake systems.

Constructed with a robust 4-ply silicone layer reinforced with polyester fabric this hose features a continuous operating temperature range from -65deg;F to 350deg;F ensuring reliable performance in extreme conditions. With an outer diameter of 3.14 inches and an inner diameter of 2.75 inches this hose is designed to provide seamless compatibility with various system requirements.

The length of 36 inches offers ample flexibility for diverse installation needs while maintaining structural integrity. The product's burst pressure rating of 275 further underscores its durability and efficiency in high-pressure environments.

MPN: 5581-275

Supplier Part Number: 5581-275

Specifications

Color
Blue
Hose Color
Blue
Hose Type
Auto/Truck Coolant Hose
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: Howard W on Nov 25, 2025, 6:03 PM
What kind of pressure can this hose handle before it blows?
Answer by: Customer Support on Nov 27, 2025, 6:01 AM
This silicone hose has a burst pressure rating of 275 psi, so it's pretty stout.
Question by: Larry B on May 14, 2025, 8:15 PM
Running a heavy-duty cooling system on a Class 8 and need to know if this hose can handle the temps we see on long hauls, gets pretty hot under that hood. What's the actual operating range on this thing?
Answer by: Customer Support on May 16, 2025, 12:13 PM
Continuous operating range runs from -65°F all the way up to 350°F, so it holds up through extreme heat and cold without degrading. The 4-ply silicone construction reinforced with polyester fabric is what keeps it stable across that range. For long-haul trucks running hard in high-heat conditions, that thermal tolerance is more than sufficient to maintain a reliable seal and keep flow consistent.
Question by: Floyd W on Jun 12, 2025, 4:02 PM
got a tight spot to run coolant line. what are the actual hose dimensions on this one
Answer by: Customer Support on Jun 14, 2025, 1:52 PM
It has a 2.75 inch inner diameter and a 3.14 inch outer diameter, and the hose length is 36 inches.

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