Made of 55 durometer thermoplastic elastomer, Vented Dust Caps cover canisters, connectors, and tube ends, helping to prevent damage and contamination. Products come in sizes from 3/16–5/8 in. ID and in variety of colors, including blue, green, red, white, and yellow. Featuring ergonomic design that facilitates installation and removal, caps have interior ridges that maintain ventilation while preventing pressure build-up.