EDWARDS IQDP OR QDP DRY PUMPS USE THIS EXHAUST CHECK BALL VALVE TO HELP WITH THE NOISE LEVEL. WE HAVE ALL THE ELBOWS, FLEX BELLOWS, CENTERING RINGS AND KF AND NW SIZE AND TYPE ACESSORIES.. WE DISASSEMBLED, DECONTAMINATED, AND REPLACED THE ONLY CONSUMABLE PART (1) ORING. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Semiconductor & PCB Manufacturing Equipment\Wafer Processing\Wafer Processing Equipment". The seller is "rjrproducts" and is located in this country: US.