Rheem warranty does not allow flex connector only hard gas pipe..also gas line should be properly sized to make sure there is enough volume of gas to the unit. Most unit fire at 199,000 btu and if your gas meter is more than 20 ft away and you have more than 1 gas appliance on the line there can be problems with firing if more than one appliance try to fire.. So you should have a qualified technician check before install..
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Rheem warranty does not allow flex connector only hard gas pipe..also gas line should be properly sized to make sure there is enough volume of gas to the unit. Most unit fire at 199,000 btu and if your gas meter is more than 20 ft away and you have more than 1 gas appliance on the line there can be problems with firing if more than one appliance try to fire.. So you should have a qualified technician check before install..
They do make a 3/4 inch flex. You may need to go to a plumbing wholesale outlet to find one.