I have 2 sets of these. First set is Apeks GripLock that came with my WTX-D30 BP&W. These are just about long enough (requires some finessing) for a 15L Steel. So I’ve transferred them to my Aluminium BP and they’re great for Steel 12L tanks.
I bought an AquaLung set off eBay and they are 200mm longer. I’ve checked the model number 767505
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These work with 15L but I’ve routed them slightly differently
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They’re much easier to use than regular cam bands (not sure how much heavier they are if used in a travel setup) and I also prefer them to the Scubapro ones I had on my Hydros.