... inner tube disengages itself from the barrel. 1.5m and 3.0m length core barrels are avaiable. Wireline series Core Barrel available:Q series Core Barresls ... -101, T6-131WF series Core Barresls: HWF, PWF, SWF, UWF, 412F We also supply NMLC, HMLC Core Barrel.Double Tube & Single Tube Core Barrel: NWG, HWGWe ...