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Silicone Rubber Blue Coolant Hose, 4.39 Inch OD, 4.00 Inch ID, 36 Inch Long

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Description & Features

Specifically designed for stringent requirements the FLEXFAB silicone rubber coolant hose offers optimal performance in diverse applications including refrigeration air conditioning pressure washers and hydraulic brake systems.

This 4-ply silicone hose with a 4.39 inch OD and 4 inch ID measures 36 inches long and is reinforced with polyester fabric. It is coated with a specially compounded silicone elastomer providing a continuous operating temperature range from -65deg;F to 350deg;F.

Constructed to meet or exceed SAE J20 R1 Class A and TMC RP303B Class 1 Grade 1 specifications it aligns with most OEM truck manufacturers' standards. This robust hose has a burst pressure of 150 psi making it suitable for demanding industrial usages.

Product Model Label: Special Application Hose

Supplier Part Number: 5581-400

Specifications

Color
Blue
Hose Color
Blue
Hose Type
Auto/Truck Coolant Hose
Nominal Size
#04
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: Warren R on Jun 18, 2025, 6:27 AM
got a 4 inch coolant line i need to replace. is this hose actually 4" inside and how long is it?
Answer by: Customer Support on Jun 19, 2025, 3:42 PM
The inside diameter is 4.00 inches, the outside diameter is 4.39 inches, and the hose length is 36 inches.
Question by: Dean W on Apr 14, 2025, 9:29 AM
What's the temp range on this hose? We run equipment through some real cold winters and hot summers both, and I need something that ain't gonna crack or swell up on me.
Answer by: Customer Support on Apr 16, 2025, 6:52 AM
From negative 65 degrees F on the cold end up to 350 degrees F on the high end, this hose covers a wide range of operating conditions. The silicone elastomer coating holds up in both extremes without going brittle in the cold or breaking down under heat. For seasonal equipment that sees hard winters and hot summer runs, that range gives you solid coverage on both ends.
Question by: Johnny B on Dec 27, 2025, 7:48 PM
What's the max pressure this hose can handle before it bursts?
Answer by: Customer Support on Dec 29, 2025, 11:15 AM
This hose is built to withstand a burst pressure of 150 psi.

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