Abstract: Adapters for coupling optical fiber. A first adapter includes ports for receiving optical fiber fitted with a first interface connector. The adapter includes first interface ports mounted to a block. The block has an outer dimension corresponding to a panel cut-out for a second interface adapter. Mounting clips may be preformed in the block. A second adapter includes a duplex retention latch including a first retention latch for receiving and gripping a first optical fiber connector and a second retention latch for receiving and gripping a second optical fiber connector. The first and second retention latches are joined by a connecting member integral with the first retention latch and the second retention latch. A third embodiment includes mounting clips that extend through openings formed in the adapter body.