304 grade stainless steel with Sulfinert treatment required for metal components when analyzing for parts-per-billion levels of organo-sulfur compounds. For HS-20 (long tx) and HS-10 transfer line. 0.74mm (0.029") OD and 0.53mm (0.021') ID, 6ft. Maximum temperature of 450 °C in an inert atmosphere. Replacement for 221-76863-32.