Get current pricing for Welch Chemstar, Welch 1402N 5.6 CFM Welch Chemstar Vacuum Pump, Belt Driven. 1/2 Hp, 115/230v, 1 Ph, 60 Hz Motor. 1 Inlet/outlet. 2 Stage. Model No: 1402n-01, Ed121432. On-off . Product Category: Process Equipment, Sub Category: Process Pumps: