IPEX
A threaded plug is threaded into an FPT fitting to close it off. This is not a permanent seal as it can be unthreaded when needed.
3/8-In. x 10-Ft. Steel Pipe, Threaded, Black
Anderson Metals Tube Fitting Brass 90 Degree Elbow Flare x MPT
Anderson Metals Compression Fitting Coupling Brass
Brass Flare Plug, Lead-Free, 5/8-In.
Advanced Drainage Systems™ Single Wall Pipe