This is the OMS by MiFlex Xtreme-hi HP Hose Features:OMS by Miflex Xtreme 7/1620 UNF male and 7/16-20 UNF female threaded ends. For divers that prefer a stiffer and a more streamline HP hoses, introducing OMS by Miflex Xtreme 7/1620 UNF male and 7/16-20 UNF female threaded ends. These HP hoses are 35% thinner than traditional Rubber HP Hose.