SUNGATOR 1/2 Inch Cap, 1/2" Pushfit Cap, No Lead Brass Plumbing Fitting 1/2" End Cap, Cap Off PEX, Copper, CPVC, with 1 Disconnect Clip, Pack of 12 - Amazon.com
ASME B16.11 Threaded Pipe Cap, End Cap Manufacturer
Pipe Fittings Cap
Fitting it Just Right: How Tight Should a Hat be - Delusion MFG
How to Put on a Swim Cap Without Pulling Your Hair - SwimOutlet.com
1 Best CARBON STEEL CAP - Apexia Metal
Steel Pipe Cap Specifications (BW Cap & SW Cap) - Octal Pipe Fittings