Poseidon Low-Pressure Hoses are made of EPDM Rubber and are reinforced with a Synthetic Cord for Strength and Durability. The hoses Working Pressure is 390 psi (10 bar), but easily manage a pressure of up to 1,460 psi (100 bar) when Couplings are Mounted to a Regulator First and Second Stage Regulator. Hose have a 3/8" Threaded End for the First-Stage Connection and a M31-1.5 mm Inlet Threads Connection for Second Stage. Hose is available in 28", 38" 05 85" (70, 90 or 215 cm), has Chrome Plated Brass Fittings and is covered by a 24 month limited warranty. Spare Hoses make a Great Save-a-Dive Kit Item.