Flexible foam body for an air tight sealColor coded end disk with embossed size markings for fast, easy selectionStrong steel center rod with loops on both endsPistons available for all types and sizes of conduit 1/2 to 6 inFor 1/2 in, 3/4 in, 1 in, 1-1/2 in and 2 in EMT, IMC and rigid conduits