... , and PQ. T2 Series Double Tube Core Barrels: The T2 Series are thin wall double tube core barrel, used for surface exploration, especially ... wall core barrel than T2 series. They offer a cost effective, high production, which is designed for optimum production and core recovery ... Tube Core Barrels:There are double tube core barrels for WG series. Available in DCDMA size E, A, B, N and H ...