Special vacuum apparatus that can be used as a complex trap with the bottom tube or as a small manifold by itself. Can be joined to ACE 8737,8738 or 8739 manifolds or as a stand alone manifold. The complete apparatus consists of the -03 manifold and 8753-21 tube, making a trap unit. 15 mm O-Ring joint with a 0-10 mm PTFE stopcock on one end and a #15 Ace-Thred with a 0-10 mm PTFE stopcock on the other end. In the center, apparatus has an air-inlet needle valve.