38-400 Red PP Ribbed Screw Top Caps (Foam Liner) | Berlin Packaging
Blue Vinyl Cap - 3/8" Cap ID x 1/2" Inside Length | U.S. Plastic Corp.
Caplugs ZTC6Q1 Plastic Threaded Plastic Cap for Flared JIC Fittings. to fit Thread Size 5/8-18" CD-TC-6, PE-LD, to Fit Thread Size 5/8-18", Red (Pack of 150): Amazon.com: Industrial & Scientific
28-400 White PP Plastic Screw Top Cap (Foam Liner) | Berlin Packaging
1 in. x 2 in. Plastic Square Cap 10-061-015 - The Home Depot