Series 24D Accutube - Single Mount. The Accutube Series 24D Standard Probe is constructed of a 316LSS probe and a 316SS flange. The instrument flange is 1 150# ANSI flange standard (2 3/8 probe has 2.5 150# flange.) The Series 24D probe is single-mount supported and installs through a carbon steel mounting flange and weldolet. The Series 24D Accutube is factory-fitted with .5 FNPT connections and is shipped with mounting hardware complete. Series 24D Accutubes are available for line sizes 2 through 72.