ASME SB111 C44300 Seamless U Bend Tube For Coolers and Heat Exchangers ASME SB111 C44300 U Bend tube is a U-shaped heat exchanger tube made from a specific copper-nickel alloy (C44300, also known as Admiralty Brass) designed for excellent corrosion resistance in marine and freshwater environments. The "ASME SB111" is the standard that governs its material and manufacture, and the "U Bend" is its formed shape for use in heat exchangers like condensers. Here are some detailed