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Silicone Rubber Blue Coolant Hose, 2.64 Inch OD, 2.25 Inch ID, 36 Inch Long

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Description & Features

The FLEXFAB Silicone Rubber Blue Coolant Hose 2.64 Inch OD 2.25 Inch ID 36 Inch Long is designed for high-performance applications in refrigeration air conditioning engine systems and air brake systems. This hose has a continuous operating temperature range of -65deg;F to 350deg;F making it suitable for demanding industrial environments.

The hose construction features a 4-ply silicone design reinforced with polyester fabric and coated with a specially compounded silicone elastomer. This ensures durability and reliability under high pressure with a burst pressure rating of 350. Meeting or exceeding SAE J20 R1 Class A TMC RP303B Class 1 Grade 1 and most OEM truck manufacturers' specifications it is engineered for professional use.

The 2.25-inch ID and 2.64-inch OD dimensions make it ideal for coolant transfer engine and brake systems where flexibility and high-temperature resistance are crucial. The 36-inch length provides the necessary reach for various setups while maintaining structural integrity and performance efficiency.

MPN: 5581-225

Specifications

Burst Pressure
350
Brand
Flexfab
Brand
Flexfab
Pack Size
36.00
UOM
LN3
Hose I.D.
2.25
Hose O.D.
2.64
Length
36
Supplier Part Number
5581-225
Alternate Part Numbers
Alternate Part Number 5581-225, Alternate Part Number C1KH11, Alternate Part Number MI-06725393, Alternate Part Number MINO-01591X00010
Product Weight
4.10 lbs

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Product Questions & Answers (2)

Question by: Roger E on Jan 3, 2026, 11:27 AM
Running a 2.25 inch ID coolant hose on a heavy truck setup and need something that won't give out when things get hot under there. What kind of temps can this one actually hold up to?
Answer by: Customer Support on Jan 4, 2026, 11:56 AM
Continuous operation anywhere from -65°F up to 350°F is what this hose is rated for, so heat under a truck hood isn't going to be a problem. The 4-ply silicone construction reinforced with polyester fabric holds up well in those kinds of demanding engine bay conditions, and it meets SAE J20 R1 Class A along with TMC RP303B Class 1 Grade 1 requirements plus most OEM truck manufacturer specs. For coolant transfer in a heavy-duty application, it's built to handle the job without degrading from temperature swings.
Question by: Joyce H on Nov 28, 2025, 11:57 AM
got a tight spot on a truck, is that 2.25 inch the inside size or outside size?
Answer by: Customer Support on Nov 30, 2025, 6:21 AM
Inside diameter is 2.25 inches, and the outside diameter is 2.64 inches. The hose length is 36 inches.