LTWFITTING 3/8-Inch Brass Compression Cap Stop Valve Cap,Brass Compression Fitting(Pack of 60) - Household Rough Plumbing Valves - Amazon.com
LTWFITTING 3/8 in. O.D. Compression Brass Cap Fitting (60-Pack) HF61CAP660 - The Home Depot
W61-6SCBULK ACME 3/8" Brass Compression Cap — American Copper & Brass
Ironwerks 3/8" OD Brass Compression Cap Fitting, Stop Valve Cap, Lead-Free To Close Off Unused Pipe - 2 Pack - Amazon.com
Standard Brass Compression Thread End Cap
Compression fitting plug - 3/8" - Master Plumber®
3/8" Brass Compression Cap Stop Valve Cap Brass Compression Cap Male Threaded for Water Pump Ports, Drain Pipes, Oil Sensor Holes, Engine Block Holes (2 Pieces) - Amazon.com
Brass, For 3/8 in Tube OD, Cap - 4CXY9|6BLP6-B - Grainger
3/8" od Brass Compression Cap, LF
3/8" Brass Compression Cap, Lead Free - RJ Supply House