Aluminum 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.
Note - 2 inch NH / NST is very rare and is often mistaken in place of 1.5 inch NH / NST. When measuring, always try to measure the male coupling! The majority of customers who order 2" NH / NST need 1.5" NH / NST. If you have a fire department connection, hose, or an adapter, check the female coupling for numbers or letters. Most 2.0 inch hoses use 2.0 inch NPSH couplings.
The outside diameter of a 1.5 inch NH / NST male hose coupling or fire hydrant is 1.99 inches. The outside diameter of a 2.0 inch NH / NST male hose coupling or fire hydrant is 2.515 inches. The outside diameter of a 1.5 inch NPT or NPSH male hose coupling is 1.878 inches. The outside diameter of a 2.0 inch NPT or NPSH male hose coupling is 2.352 inches.
The Safe Water Drinking Act section 1417 requires "Lead-Free" products to be a minimum of 99.75% lead-free.
