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 can accommodate 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 can accommodate-thread 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.