Will Storz fittings from Red Head Brass mate with Storz fittings from other manufacturers?
Simply put, as long as they are the same size, they should. Red Head Brass manufactures Storz fittings to meet the established dimensional standards. As long as the Storz fittings from other manufacturers meet these standards, the fittings will mate. The 4″ and 5″ Storz connections, for example, are included in NFPA 1963. However, there are numerous sizes of Storz fittings available. Some are only metric sizes. Others are combination English/Metric sizes. Those sold domestically are very specific sizes for the U.S. market and are usually marked with the nominal size in inches. They may also be marked with both English and Metric units. Red Head Brass currently offers 1″ (25mm), 1-1/2″ (38mm), 2″ (52mm), 2-1/2″ (65mm), 3″ (75mm), 4″ (100mm), 5″ (125mm) and 6″ (150mm) Storz fittings.