Anti Reverse Valve for Vacuum Pump Exhaust Pipe - Fits 4 inch pipe

Description Mounts on end of exhaust pipe to keep vacuum pump from going backwards at shutdown. for 2 or 3 inch inch exhaust pipe Rubber Disk measures [---] inches O.D. (outside diameter) 67331 Assembled in USA also available 67332 for 1.5 inch 67333 for 3 inch 67331 for 4 inch 8/26