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The Culligan 151122-27 R is the correct replacement O-ring for the following filter housings:
The Culligan 151122-27 Comp. Filter Housing O-Ring is a replacement O-ring used in all Big Blue water filter housings from Pentek with 1" and 1 1/2" inner/outer diameters, except the Big Clear Housing. This filter housing o-ring is constructed with Buna-N FDA grade material and measures 5 3/4" in diameter.