Caplugs Plastic Tapered Cap and Plug with Wide Flange W-2, PE-LD, Cap OD 0.240" Plug ID 0.375", Red (Pack of 1000): Amazon.com: Industrial & Scientific
Flexible Tapered Vinyl Caps & Plugs | TV Series | Caplugs
TV-1 Flexible Vinyl Tapered Plug/Cap - Fits Tube ID 0.234" to 0.270" | U.S. Plastic Corp.