Get current pricing for Doyle & Roth, 19 Sq. Ft. Doyle & R 19 Sq.ft. Horizontal Shell & U-tube Type Heat Exchanger, Mfg. By Doyle & Roth. 304l Stainless Steel Rated For 100 Psi @ 350 Deg. F., 6.6 O.d., 3 . Product Category: Process Equipment, Sub Category: Process Heat Exchangers: