Just curious if anyone had ever tried these:
www.tradeinn.com
I mostly dive doubles, but have a few big singles with H-valves, and, if I use a single tank adapter, it can be hard to reach the right side valve behind my head. Just wondering if these would fix that issue. It looks like they come in both metric and 3/4 NPSM thread.

Metalsub Twin Line 3/4´´ valve Black | Diveinn
Get Metalsub Twin Line 3/4´´ in Black Silver for 77.49 €. Ideal for dive with fast delivery. Buy Valves at Diveinn!
I mostly dive doubles, but have a few big singles with H-valves, and, if I use a single tank adapter, it can be hard to reach the right side valve behind my head. Just wondering if these would fix that issue. It looks like they come in both metric and 3/4 NPSM thread.