2.5" NST (NH) Female Hose x 1" NPSH Male Hydrant Adapter FM2525NYFD Threaded Size (Inside Diameter): 4"

Threaded Size (Inside Diameter): 4" Female NPT (National Pipe Tapered)

5" NYC Male threads

but you need an adapter to fit to a hydrant

They are the more economical choice

2.5" NST (NH) Female Hose x 1" NPSH Male Hydrant Adapter FM2525NYFD Threaded Size (Inside Diameter): 4"Change & Reduce Threads From 2. 5" NST (NH) Female To 1" NPSH Male Pipe. This will reduce your 2. 5" outlet or hose down from 2. 5" NST Female to 1" NPSH Male. Hook two different sizes of hose together, or connect to an outlet. It's one of the most popular and common way to connect different size hoses. Simply screw it on, and you're ready to go. The 2. 5" NST (NH) Female side of adapter can hook into 2. 5" NST (NH) Male threads. The 1" NPSH Male side