... pairun is manufacturer and distributor of high quality heat exchanger tubing with one of the largest inventories available 24 hours ... distribution capabilities.Heat Exchanger Specifications offered Trade NameWelded ASTMSeamless ASTMCarbonA-214A-179Low Temp CarbonA-334 1, 3, 6, 7, 8, 9 ... A-268 TP 409, 430, 439TitaniumB-338 Grades 2, 7, 12, 16B-338HastelloyB-626B-622Admirality 443 BrassB-543SB-11190/ ...