Copper Tubes For Water And Gas : Copper Tube to BS EN 1057 - R250 (Previous Designation BS 2871: Part 1: Table X) Half Hard Straight. This products is supplied in 3 or 6 meter straight lengths in the half hard condition, an ideal temper for cold bending and forming. ABC Tubes can be easily bent on an appropriate bending machine for 6 to 22mm O.D. sizes, with a bending spring. Its ease of manipulating and relatively light weight, combine with its ability to withstand high internal pressure makes Mex-flow the ideal products for most hot and cold water, central heating and gas services installations. This is the general-purpose copper tube for above ground services. Ideal for Drinking Water, Central Heating, Sanitation, Hot and Cold Water, industrial Medical Gas Transportation and Various Engineering.