Sievert high pressure hoses conform to the EN ISO 3821 standards. Sievert hoses are also extra frost resistant and can be used in temperatures down to -30 ºC. The Sievert hose is designed with three layers – an inner layer of black gas resistant rubber, a middle layer of reinforcing weave to withstand high pressure and an outer orange coloured layer to protect against external damage, sunlight and ozone.