MOCAP Tapered Polyethylene Plastic Plug Caps are inexpensive dual function closures which can be used as either a plug or a cap. These tapered polyethylene plug caps are made from tough but flexible polyethylene to form a secure fit, yet easily removed. Outside Length: 0.44in / Flange Diameter: 0.75in / Small Inner Diameter: 0.468in / Small Outside Diameter: 0.532in / Large Inner Diameter: 0.545in / Large Outside Diameter: 0.608in