The Poor Man's DSV works quiet well. BUT, staging is one of the things that began us talking about DSV valves a long time ago for the PRAM. Unfortunately, most don't understand why it is that some of us want one. It just goes over their heads. I have made the PVC DSV but it just does not meet my esthetic needs. The PMDSV does work, the plug stays clipped to my LH D ring with my whistle, which then secures the mouthpiece to the LH D ring when deployed. Yes, staging with a PRAM is a challenge until we get a good DSV. I have had my PRAM to over 150 feet, used it with nitrox etc, works fine and breaths just as nice at 150 feet as it does at 10.
For the Sherwood, one of mine has three posts. Yep, you can mount three posts. This way you can use the center for a double hose, the left for a reverse mount backup and for other diving you can mount two single hoses (one reverse). The Sherwood is a nice manifold but it is not full isolating. Not sure it would be my choice for wreck diving today. But,I do like them and I amin the market for another nice one, saving my pennies. I plan to mount it to twin 40s. that gives me double 40s, double 50s, double 72s. My double 85s are on a isolation manifold. I love those double LP 85s, pumped up to 3,000 there is a lot of air there, no can use with a double hose however with a modern isolating manifold, too bad that.
Creed has far surpassed me, I only have seven fully functional double hose, each one of them is cherry but I dive them all. I don't collect single hose stuff, I have a good assortment of Voit MR12s, Teknas and Conshelfs but aside from those, old single hosers don't interest me, they are just as girly mahn then as now.
N