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

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

Product Questions & Answers 2

Product Questions & Answers

what's the temp range on this hose? running a diesel that sees some pretty cold winters and hot summers both

Question by: Sherry M on Apr 18, 2025, 7:46 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.

Answer by: Customer Support on Apr 19, 2025, 8:04 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”

Question by: Wade R on Apr 10, 2025, 10:56 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.

Answer by: Customer Support on Apr 12, 2025, 6:48 AM

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FLX5581-225	2.25	2.64	350	36
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