Thank you for the info....the poseidon regs unfortunately do not take the abuse that happens in stunt and water shows.....and they seem to be more touchy for the dive techs on the staff to maintain, and they are expensive.... we will try the Hollis, and the Omega, and the Mares octopus.... Also looking for the thinnest lp hose to go to the regs.....working with a costume designer for an underwater show.....and they are trying to hide the hoses....Have used milflex....anyone know of thinner hoses?