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Silicone Rubber Blue Coolant Hose, 2.27 Inch OD, 1.88 Inch ID, 36 Inch Long

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Description & Features

Engineered for demanding applications this 4-ply silicone hose constructed with reinforcement from polyester fabric ensures durability and strength. It features a length of 36 inches and an inner diameter of 1.88 inches while the outer diameter measures 2.27 inches. Designed to withstand continuous operating temperatures from -65deg;F to 350deg;F it meets or exceeds the requirements of SAE J20 R1 Class A and TMC RP303B Class 1 Grade 1.

Ideal for use in hydraulic and air brake systems the FLEXFAB Silicone Rubber Coolant Hose FLX5581-187 resists cracking and ozone ensuring reliability and longevity. Tested to handle burst pressures up to 400 PSI this hose is a versatile component suitable for various industrial applications involving coolant transfer.

Coated with a specially compounded silicone elastomer it adheres to most OEM truck manufacturers' specifications. This hose is particularly suited for refrigeration air conditioning and pressure washer environments making it an essential part for maintaining efficient operation in demanding settings.

Supplier Part Number: 5581-187

Specifications

Burst Pressure
400
Brand
Flexfab
Brand
Flexfab
Pack Size
36.00
UOM
LN3
Hose I.D.
1.88
Hose O.D.
2.27
Length
36
Supplier Part Number
5581-187
Alternate Part Numbers
Alternate Part Number 5581-187, Alternate Part Number C1KL95, Alternate Part Number MI-08749337, Alternate Part Number MINO-01591X98013
Product Weight
3.53 lbs

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Product Questions & Answers (3)

Question by: Lance R on Aug 26, 2025, 6:46 AM
got a tight spot on a truck, what size is this hose again and how long is it
Answer by: Customer Support on Aug 28, 2025, 6:20 AM
You are looking at a 1.88 inch inside diameter, 2.27 inch outside diameter, and a 36 inch length.
Question by: Billy B on Sep 26, 2025, 7:13 AM
Does this hose hold up alright in extreme cold? We run equipment through some pretty harsh winters and can't afford a hose crackin' on us mid-season.
Answer by: Customer Support on Sep 27, 2025, 4:38 PM
Continuous operating range on this hose runs from -65°F all the way up to 350°F, so cold winters aren't going to be a problem. The silicone construction also resists cracking and ozone degradation, which makes it a solid choice for equipment that sits in the cold between uses and then gets cycled hard once it's running. It's built to stay flexible and reliable across that full temperature swing without breaking down over time.
Question by: Gene E on Oct 15, 2025, 10:09 AM
Reckon this hose could handle the coolant lines on my old Ford? They get pretty hot.
Answer by: Customer Support on Oct 16, 2025, 12:31 PM
Designed to withstand continuous operating temperatures from -65°F to 350°F, this silicone rubber hose should be suitable for your Ford's coolant lines, provided those temperatures fall within that range.