Graduated addition funnels with outside jacket for cooling or heating. Jacket extends from just below shoulder of vessel down to the bottom tube just above the bottom stopcock. Stopcock is 2 or 4 mm bore PTFE. Bottom drip tube extends to the bottom edge of the lower, inner standard taper, joint, Top outer stopcock size matches the bottom joint size. Side hose connections are size D for 3/8-inch (9.5 mm) ID tubing.