ISO 6993-3:2006

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Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels — Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa)

ISO 6993-3:2006 refers to an International Organization for Standardization (ISO) standard that specifies requirements for "buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels" - specifically focusing on fittings and saddles designed for a maximum operating pressure of 1 bar (100 kPa).