Sievert high pressure hoses conform to the EN 559/ISO 3821 standards. Sievert hoses are also extrafrost resistant and can be used in temperatures down to -30ºC. The Sievert hose is designed with aninner layer of black gas resistant rubber, a middle layer of reinforcing weave to withstand high pressureand an outer orange coloured layer to protect against external damage, sunlight and ozone.