The CIR20TF from ITT CANNON is metal dust cap with shell size 20, 41.0mm (1.61 Inch) diameter, 21.0mm (0.83 Inch) cap length and 127.0mm (5.00 Inch) chain length. This cap seal the front of receptacles CIR00, 01, 020, 030, 05, 070, TB. Include a chain for retention of the cap at the required location.