depends on local building codes ..
If you turn OFF the shut-off for the Dryer, and have the old Dryer's gas line disconnected from the Dryer,
they might hook it up...
otherwise they'll drop it off, and you could connect whatever ..
From my understanding of the building codes, they require the shut off valve no more than 6 feet from and in the same room as the appliance. Everyone I spoke with felt that the dryer installers would take one look at the existing setup and refuse to do the installation. Accordingly, I had a plumber come in and put in a shut off valve, which required a 2 foot section of iron pipe in order to do a left turn and then a 1 foot section of iron pipe to rise into the laundry room behind the dryer. The whole job took the plumber about 3 hours and ended up costing me $671.00. Oh well, at least the installation will comply with code and be safer than it was.