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ISO valves are manifold or sub base mounted types designed to a European specification standardizing air flow, drillings and valve body size requirements in order to have interchangeability amongst valve manufacturers. Kuhnke manufactures a complete line of ISO-1 and ISO-2 valves and accessories used for new or replacement installations.
A set of ? inch ported valves are also available which meet the European NAMUR which standardizes mounting hole patterns.