Apache casing spools have a C-22 profile with a straight bore bowl design with 45 degree load shoulders. Bottom prep can be standard PE/BG, O2 bottom (below 5,000 psi applications) or HPE Bottom C-29 Casing Spools are based on the same design as the C-22 with a larger bowl. Which permits the acceptance of the C-29 Casing Hanger with larger load capacity.