I clip is to the d-ring on the opposite side. I just position the d-ring low enough so the chest strap doesn't interfere with the dry suit inflator.
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I got a pair of Hog D1s when I started SM, just because, and have had no problems with them. I added a couple more for stage and deco use, and am now waiting for the new second stage which will convert to left-hand feed. Since I have been doing all my cave dives with another SM diver, no mixed teams, I can replace the long hose and go with a short hose and a LH feed reg. I tried it last trip and found it very clean, less clutter. It won't be too long before I'm groveling through small holes, with a sound track playing in my head!