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The 12 in tall extension for the 18 x 30 package system allows for a deeper burial for longer pitched pipe runs. The units are designed specifically to be used for an indoor application with our 18 x 30 package systems. The extension comes complete with everything needed to be installed onsite.
Zoeller® 31-1473 Riser Extension With Hardware, Poly Structural Foam, For Use With: 18 x 30 in Sump Basins