BTB-27 Bottle Modified fabricated with a slant-bottom and designed to be used as a retention tank fitting onto a large distillation process system. Bottle has a fill, vent, diptube cap-assembly, shoulder fittings for sightglass and detachable tanks illuminating device, mounting bracket for easy attachment onto processing system, tri-clamp fitting on side for a thermocouple, and a threaded/Swagelok® bottom-discharge fitting.