4 x 5 316 Stainless Steel NippleThe 4 Male Pipe Thread x 4 Male Pipe Thread 316 Stainless Steel Welded Pipe Nipple is a pipe fitting used to connect two male threaded pipes at each end. "Welded" refers to the process where a section of pipe is welded together, and the ends are then threaded to form the male pipe threads. Specification Details TYPE 316 Stainless Steel Nipple DESIGN Welded and then threaded, ensuring a strong and secure connection. MATERIAL Stainless Steel for