The CTA Transmission Oil Drain and Flush Kit, No. 7650, is designed to drain and flush the transmission oil cleanly with the use of air pressure. According to the company, most draining methods use gravity, leaving up to 2.6L of oil throughout the system. The 7650 kit uses compressed air pressure from your shop to remove 90 pecent of all the transmission fluid from the system, says the company. The kit includes three adapters which are for servicing Mercedes-Benz 722.6 and 722.9 transmissions, and BMW 6hp and 8hp transmissions.