Seamless 316 stainless steel instrumentation tube, bright annealed (BA), made to ASTM (ASME) A269. Its clean, high-quality inner surface suits fluid lines that need a clean environment. Working pressures range from 2,400 psi to 5,100 psi depending on size, in 1/4" to 1" OD. Use with Hiflux Lok tube fittings for best results.