There are lots of reasons that I dive with an H valve on singles, including redundancy, consistency, and convenience.
The LP DIN valves can be easily and quickly converted for use with a standard yoke regulator set-up with a donut and a hex key.
The downside is that they cost a little more.
If all of your diving is restricted to warm shallow water, then I don't think it's worth the aggravation. A first stage blowout will end your dive in these conditions, but not your life - especially if you keep your buddy close. If your diving ever includes cold water, deeper water or any technical diving, then DIN H valves are the way to go.
H Valve photo
Another H Valve photo
Steven
The LP DIN valves can be easily and quickly converted for use with a standard yoke regulator set-up with a donut and a hex key.
The downside is that they cost a little more.
If all of your diving is restricted to warm shallow water, then I don't think it's worth the aggravation. A first stage blowout will end your dive in these conditions, but not your life - especially if you keep your buddy close. If your diving ever includes cold water, deeper water or any technical diving, then DIN H valves are the way to go.
H Valve photo
Another H Valve photo
Steven