Replacement lid gasket for 60L - 500L Speidel Rectangular Plastic Storage tank lids. Please note these replacement gaskets are for the newer generation tanks introduced in 2017. A redesign of the lid called for a different sized gasket. The new generation gaskets are 7-3/4" in diameter and 3/8" thick. The older generation gaskets are 7" in diameter, and 1/4" thick. For the Pre 2017 lid gasket please see item 38014.