22MP - Tri-Clamp x Female NPT AdapterThe 22MP Tri Clamp and Female NPT Adapter is a popular sanitary clamp fitting designed to connect Tri Clamp ferrules to male NPT pipes, valves, or equipment. It comes in two materials, 304 and 316L stainless steel, and a variety of sizes. The tube has an outside diameter (O. D.) of " up to 4". The female NPT threaded connection ranges in size from " to 4". They are designed for use in sanitary applications. Tube O. D. NPT Size A 1 2" 1 4" 3 8" 1 2" 3