Jacketed version of 7297 series addition funnels. Jacket runs from shoulder at top of vessel to above the PTFE stopcock. Has size D hose barbs for 3/8in ID tubing. Pressure equalizing arm runs from top of vessel to just below the PTFE stopcock. Graduations are both in ascending and descending volume. Both top and bottom joints are the same size. Bottom drip tip extends to the edge of the bottom inner joint. Top outer joint is reinforced for safety. 4mm PTFE stopcock plug bore.