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The regulator and check valve should arrive today and I will replace them. While I am at it i want to replace the fitting marked by the red arrow in the picture. Al has been very helpful in directing me with part numbers and a source to order. Anyone know part number of this?

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Hard to tell in the photo, but is that a pressure relief valve?
If so they are generic, but you need the upper limit to match the compressor. You don’t want to put a 175 PSI on a 120 PSI system. If you couple the aux system to the bus accessory system you need at least 130 PSI because that is the upper limit for the Prevost.
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Thomas who manufactured the compressor might be able to help with that.
FWIW…is yours leaking ?
AL
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