Caplugs 99394170 Plastic Round Cap VC-2250-16, Vinyl, Cap ID 2.250" Length 1.000", Black (Pack of 4)   Pliable Vinyl End Caps can stretch up to 1/16" larger for a snug fit without tearing, splitting, or shredding Made in the USA by ISO 9001 Certified CAPLUGS | Soft PVC "rubber like" that will hold up for years of use. Easy to use - push on, pull off Durable protective closure Reference your inner diameter to select size. Select the size that matches or is slightly smaller than the pipe or tubing outside measurement .