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The Pelican 1723 O-ring is a replacement for the one supplied with the Pelican 1720 Long cases. It maintains a watertight, moisture and dust proof seal.
The Pelican 1721 Foam Set is a 3-piece set of replacement foam for the Pelican 1720 Long case. The set consists of 1 convoluted top lid foam, 1 sheet foam section and one 1.0" blank bottom foam.