Companion Brands POL Cylinder to 3/8" LH Left Hand Straight Adaptor POL21 This adaptor allows you to convert your BBQ Gas Bottle to a 3/8 BSP so that your 3/8 appliances can be utilized without buying a whole new gas hose. Features: High-quality brass adaptor Thread (in) POL male Thread (out) 3/8" BSP LH male The companion brands gas adaptor connects 3/8"LH hoses for all Primus Heating Torches and many high-pressure outdoor cookers.