Double-lock In conformity to NSF 61 for drinking water standard Inner hose: EPDM, UNIPRENE,SAHEOPRENE Inner hose size: OD 9mm * ID 7mm Outer diameter: 12.5mm, 14mm optional Working pressure: 290+/-10psi max Working temperature: 90+/-2oC max for EPDM, 120+/-2oC max for UNIPRENE and Saheoprene Fittings: brass or stainless-steel