The H adapter evolved from the Y valve. Originally produced by Sherwood in the 80's, the dual outlet Y valve for yoke regulators allowed divers to do limited overhead penetration while still having two independent regulator systems for redundancy. The H adapter is the latest generation of dual outlet single tank diving. The H adapter screws into the crossbar outlet of the K valve so a second regulator can be attached for technical diving. Our H Adapters are compatible with any of our 200 bar or 300 bar valves. The H adapter is available in 200 bar only and equipped with shock absorbing ribbed rubber knobs that are rugged, yet easy to manipulate. As an integrated part of the valve no relief disks are necessary. All Dive Rite valves come with Viton o-rings and oxygen compatible lubricants and are Nitrox ready up to 40-percent.