Challenger O-Ring Replacement Kit Back Catalog number: 811-9913-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended GCU37500PVCMW-2 Cassette, 37mm 2pc 5.0µm, PVC Matched, (50µg), 50/Box Price on request 811-1004-02 PM-10 Impactor Kit, Replacement for Models 810-1002 and 810-1003 Price on request 800803 Kit-Plunger Replacement Sf&H Price on request