I haven't seen a 290RLS recently, but if I remember correctly, the gas range/oven is in the center of that slide and there is a "outside quick disconnect LP fitting further aft from where you see the copper branch line going up into the underbelly. That copper line goes up, turns forward and connects to a bracket where the rubber flexible hose goes under the slide and then up into the slide to supply the range/oven with propane. If you have the optional gas/electric Dometic refrigerator, that LP line also provides propane for the refrigerator.
On the 290's that I've seen, the black iron pipe (at that T fitting, then goes straight back to a LP QD under the trailer, below the roadside tail light or the black pipe turns toward the curbside and runs under the trailer, to the curbside and the LP QD fitting is on the aft curbside of the trailer, behind the curbside slide.
That branch line you see is for the range/oven and goes "up into the belly to connect to a rubber hose that goes up into the slide to supply gas to the range/oven".... The fireplace is electric only and has no gas connection.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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