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What is Outer Diameter of Flair It High Pressure Hose part # FL57FR  

Updated 02/16/2026 | Published 02/07/2026

Question:

What is the OD measurement for FL57FR?

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Expert Reply:

Hey Leo, the outer diameter of the Flair It High Pressure Hose part # FL57FR that you referenced is 7/8 inches. Are you trying to match the hose size that you have now?

expert reply by:
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Jameson C

Expert Reply:

Hey Leo, the outer diameter of the Flair It High Pressure Hose part # FL57FR that you referenced is 11/16 inches. Are you trying to match the hose size that you have now?

expert reply by:
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Jameson C
Bill M. profile picture

Bill M.

2/13/2026

Hey Leo (and Jameson), You probably have your answer by now, (and I don't mean to contradict Jameson), but If we're talking about the 1/2" ID hose (part # FL57FR), which I used to install a new water pump and an expansion tank, the outside diameter is actually closer to 11/16". And I was able to use 5/8" crimp rings to clamp to the 1/2" hose barbs, (although they were a little tight, but that's all I had). So far, so good after a couple of years.

Jameson C. profile picture
Etrailer Expert

Jameson C.

2/16/2026

@BillM thanks! I'll update to the dimension you mentioned.

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