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Old 13-02-2021, 09:03   #1
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Hose selection for Cooling Water outlet

I am replacing the hoses on my vented loop between the heat exchanger and the mixing elbow. The PO used shields 210 a wired wet exhaust hose which I think has been discontinued.
Can I use Shields 135 non-wire heat exchanger hose or should I move up to Shields 250?
Short 12 inch runs with no tight bends.
Yammer 3GM30F. 5/8 Hose
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Old 13-02-2021, 09:21   #2
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Re: Hose selection for Cooling Water outlet

Shields 135 H.D. Water Hose is NOT recommended, for engine intake.
Series 250 Shieldsflex II is rated excellent for engine intake, as is Series 262 Corrugated Nautiflex Silicone Exhaust Hose.
Per Shields https://marcs-marine.com/wp-content/...09/Shields.pdf
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Old 13-02-2021, 09:47   #3
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Re: Hose selection for Cooling Water outlet

Thanks for the quick reply. I am using the 250 on the intake side but this section is after the heat exchanger which does not have any risk of imploding. The 135 has the same temperature rating (200F) and close to the same pressure rating 200 psi vs 275 psi.
Also, Shields recommends the 135 for “heat exchanger” applications. This is attached to the outlet of the heat exchanger so I am not worried about that end. My concern is the attachment to the mixing elbow. But if they have the same temp rating, it seems this should also not be a problem.

I am only asking because I have 135 and my local retailers do not carry the 250 in 5/8
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