SAME DAY SHIPPING
— Order by 2pm EST.
Toggle Nav
Cart
Search
main product photo

Silicone Rubber Blue Coolant Hose, 1.77 Inch OD, 1.38 Inch ID, 36 Inch Long

Ask A Question

Description & Features

The FLEXFAB Silicone Rubber Blue Coolant Hose is designed with a 1.77-inch outer diameter and a 1.38-inch inner diameter, measuring 36 inches in length. This 4-ply silicone coolant hose is reinforced with polyester fabric and coated with a specially compounded silicone elastomer, ensuring durability and performance.

Engineered to meet or exceed SAE J20 R1 Class A, TMC RP303B Class 1 Grade 1, and most OEM truck manufacturers' specifications, this hose is capable of operating continuously from -65deg;F to 350deg;F. This makes it ideal for applications in refrigeration, air conditioning, and engine systems requiring robust and reliable coolant transport solutions.

This product, categorized under special application hoses, exhibits a burst pressure of 475 and provides consistent performance in challenging environments. Its construction and design ensure that it meets demanding industry standards and operational requirements.

Supplier Part Number: 5581-138

MPN: {{ecc_mpn}}

Specifications

Burst Pressure
475
Brand
Flexfab
Brand
Flexfab
Pack Size
36.00
UOM
LN3
Hose I.D.
1.38
Hose O.D.
1.77
Length
36
Supplier Part Number
5581-138
Alternate Part Numbers
Alternate Part Number 5581-138, Alternate Part Number C1KL94, Alternate Part Number MI-08749333, Alternate Part Number MINO-01591X98010
Product Weight
2.87 lbs

Similar Products

Model Number Hose I.D. Hose O.D. Burst Pressure Length Price Action
Silicone Rubber Blue Coolant Hose, 1.64 Inch OD, 1.25 Inch ID, 36 Inch Long

FLX5581-125 Silicone Rubber Coolant Hose

1.25

1.64

500

36

Silicone Rubber Blue Coolant Hose, 1.77 Inch OD, 1.38 Inch ID, 36 Inch Long

FLX5581-138 Silicone Rubber Coolant Hose

1.38

1.77

475

36

Silicone Rubber Blue Coolant Hose, 2.39 Inch OD, 2.00 Inch ID, 36 Inch Long

FLX5581-200 Silicone Rubber Coolant Hose

2

2.39

400

36

Silicone Rubber Blue Coolant Hose, 2.89 Inch OD, 2.50 Inch ID, 36 Inch Long

FLX5581-250 Silicone Rubber Coolant Hose

2.5

2.89

300

36

Silicone Rubber Blue Coolant Hose, 1.27 Inch OD, 0.88 Inch ID, 36 Inch Long

FLX5581-087 Silicone Rubber Coolant Hose

0.88

1.27

560

36

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

FLX5581-100 Silicone Rubber Coolant Hose

1

1.39

550

36

Silicone Rubber Blue Coolant Hose, 1.89 Inch OD, 1.50 Inch ID, 36 Inch Long

FLX5581-150 Silicone Rubber Coolant Hose

1.5

1.89

450

36

Silicone Rubber Blue Coolant Hose, 2.14 Inch OD, 1.75 Inch ID, 36 Inch Long

FLX5581-175 Silicone Rubber Coolant Hose

1.75

2.14

400

36

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

FLX5581-187 Silicone Rubber Coolant Hose

1.88

2.27

400

36

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

FLX5581-225 Silicone Rubber Coolant Hose

2.25

2.64

350

36

Silicone Rubber Blue Coolant Hose, 2.77 Inch OD, 2.38 Inch ID, 36 Inch Long

FLX5581-238 Silicone Rubber Coolant Hose

2.38

2.77

325

36

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

FLX5581-275 Silicone Rubber Coolant Hose

2.75

3.14

275

36

Silicone Rubber Blue Coolant Hose, 3.27 Inch OD, 2.88 Inch ID, 36 Inch Long

FLX5581-287 Silicone Rubber Coolant Hose

2.88

3.27

250

36

Silicone Rubber Blue Coolant Hose, 3.39 Inch OD, 3.00 Inch ID, 36 Inch Long

FLX5581-300 Silicone Rubber Coolant Hose

3

3.39

250

36

Silicone Rubber Blue Coolant Hose, 3.89 Inch OD, 3.50 Inch ID, 36 Inch Long

FLX5581-350 Silicone Rubber Coolant Hose

3.5

3.89

200

36

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

FLX5581-400 Silicone Rubber Coolant Hose

4

4.39

150

36

Silicone Rubber Blue Coolant Hose, 4.89 Inch OD, 4.50 Inch ID, 36 Inch Long

FLX5581-450 Silicone Rubber Coolant Hose

4.5

4.89

150

36

Silicone Rubber Blue Coolant Hose, 5.39 Inch OD, 5.00 Inch ID, 36 Inch Long

FLX5581-500 Silicone Rubber Coolant Hose

5

5.39

125

36

Product Questions & Answers (2)

Question by: Sherry M on Apr 18, 2025, 7:46 AM
what's the temp range on this hose? running a diesel that sees some pretty cold winters and hot summers both
Answer by: Customer Support on Apr 19, 2025, 8:04 AM
Continuous operating range runs from -65°F all the way up to 350°F, so it holds up through hard freezes and high-heat summer loads without issue. The 4-ply silicone construction with polyester reinforcement is what keeps it stable across that full swing.
Question by: Wade R on Apr 10, 2025, 10:56 AM
got a 1-3/8 inch coolant line i need to swap out. is this hose actually 1.38 ID and 36 inches long, or is that just “nominal”
Answer by: Customer Support on Apr 12, 2025, 6:48 AM
The inner diameter is 1.38 inches and the length is 36 inches, with a listed outer diameter of 1.77 inches. It’s a 4-ply silicone coolant hose, so you are matching to those stated dimensions rather than a vague size callout.