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Corrosion resistant brass construction
Square opening does not measure the same on both sides
Lubricates gaskets for longer life and easier use
NH / NST threads are used by most fire departments
and is designed for chemical suits and wet and dry dive gear
Aluminum 4" NH to 4" NPT Double Female Couplings_Brass Corrosion resistant brass constructionAluminum adapters are fabricated from seamless extruded 6061 T6 aluminum and hard coat anodized per MIL A 8625 Type III, Class 1. Threads have a blunt start Higbee cut with indicators on adjacent lugs. Part identifications are permanent and stamped prior to hardcoat. Adapters and components meet the requirements of NFPA 1963. A double swivel adapter will not swivel or rotate once both ends are tightened to the male connections. The Safe Water Drinking