Challenger O-Ring Replacement Kit Back Catalog number: 811-9913-01 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 783-0008-04 Battery Pack, Replacement BDX II, NiMH Price on request 380-0036-01-R Hex Key, 2mm Price on request 811-0909-EU-R Power Supply, 5 -Station 100-240Vac, 50-60 Hz, EU Cord Price on request