Surface temp at 70??? You aren't diving Lake Michigan. Not even Lannon with all it's goose S**t. I was out today north of Port Washington. Surface temp was 43 and it was 38 on the Mahoning. The air temp out on the boat was around 60......maybe. Milwaukee isn't going to be any better. A piston reg would have free flowed today at depth.
Apex would be a good choice though. Lots of support for them. Just make sure you reg is maintained and environmentally sealed. In these temps you'll want to dive a dry suit too. YMMV.
Jim
Apex would be a good choice though. Lots of support for them. Just make sure you reg is maintained and environmentally sealed. In these temps you'll want to dive a dry suit too. YMMV.
Jim