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 code -23 consists of the -03 manifold and our 8753-21 tube, making a trap unit. It has a 15mm o-ring joint with a 0-10mm PTFE stopcock on one end and a #15 Ace-Thred with a 0-10mm PTFE stopcock on the other end. In the center, we have an air-inlet needle valve. Bottom tube length is 220mm.