I also a pair of Dive rite Remora design for for independent double cylinder. This is perfect for traveling vacation if you want to double up two tanks when the dive operators don't have a double tank for rent. Item looks really taken care of and etc. Need to get a new double tank bolt kit, but if I could the nut bolts for it, then all you need is a washer. I'll also throw in the dive rite aluminum backplate (AS IS-there is a drilled hole on it) for free if you want it. A brand new Dive Rite Remora will cost you around $180 to $250. I'll let it go for $120 plus the backplate.