Cyclone, GK 2.69 37mm O-Ring Kit Back Catalog number: 811-9927-05 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended FTK 3010-4023 Quantifit 2 Battery Pack Price on request 811-1604-NO Gilian 12 Power Module, No Cord Price on request 811-0944-02-R GilAir Plus, BlueTooth Upgrade DL (board exchange) Price on request