Abstract: A universal gas valve finishing flange assembly is provided which is adapted to receive a plurality of different size gas valves. The finishing flange assembly comprises a flanged coupler comprising a pipe coupler having internal threads and a pair of ends. The internal threads are adapted to be received by a first gas shut-off valve with a valve stem leg having threads with a first diameter. The flanged coupler further includes a flange attached to one end of the coupler and is centered about an axis defined by the coupler. The flange further includes an orifice for receiving a gas valve key. A trim plate is also provided having a frontside and a backside and a hole there through to receive the pipe coupler. Also, the trim plate includes recess disposed in the frontside to receive the flange. Additionally, a reducer nipple is provided having outer threads and inner threads.