1.5" NPT Male Pipe x 2.5" NYFD Male Hose Adapter Rubber Fire Hose You don't need couplings because

You don't need couplings because you just want to clamp your hose onto a pipe

NH = national hose

and it is still functional

1" NPT Male x 1

Once your item is ordered

1.5" NPT Male Pipe x 2.5" NYFD Male Hose Adapter Rubber Fire Hose You don't need couplings becauseChange Threads From 1. 5" NPT Pipe To 2. 5" NYFD Fire Hose Hex Simply screw it on, and you're ready to go. The NPT side of adapter can hook into IPT, NPT, ,NPSH, and PVC threads. The NYFD side of the adapter can hook into NYFD Thread. Specifications 1. 5" NPT Male x 2. 5" NYFD Male Full Brass NPT National Pipe Tapered NYFD New York Fire Department Thread More About Double Male Adapters A pipe fitting adapter is used to connect straight pipe or hose