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I wouldn't go that route (again). I have an FL-20 and had a PFL-01 for it - the FL-20 works great in air, but I found it to be inadequate underwater. I'm in the process of upgrading to an Inon Z240, but there are other strobes out there for less that will easily outperform the FL-20/PFL-020 combo.Does the 7070 have a hotshoe? If so, do you already own an FL20 or FL36 Olympus Flash? They make housings for them. The advantage to these strobes is using the Olympus TTL from your camera.