Description 20622A Gland Assembly for Mission 4x3x13 Mud Pumps. offers a complete spare parts line of centrifugal sand pumps to suit for all kinds of drilling sand pump application. Size ranges from 3x2x13, 4x3x13, 5x4x14, 6x5x11,6x5x14, 8x6x11,8x6x14, 10x8x14, 12x10x23 to 14x12x22b.