Carbon Column Tank, dished bottom and top, 2 in bottom tank outlet, 2 in bottom tank inlet to star manifold, top flanged inlet 15-1/4 in ID, 23-1/2 in OD, 2 in top inlet to star manifold, 2 in top outlet to pressure gauge, 38 in bottom clearance, inner dimensions: 47 in Dia x 11 ft 11 in ( includes 10 in H bottom dish, 10 in H top dish) overall dimensions: 50 in W x 15 ft 6 in H.