Air Operated Brake Bleeder and Fluid Transfer (MK0238) : Works with your air compressor to completely flush and refill the brake system on most vehicles. Convenient one-person operation Flush and refill entire brake system Use only DOT certified brake fluid Capacity: 34 oz., Adapter sizes: 21 to 30mm, 24 to 32mm, 28 to 37mm and 32 to 41mm Air requirement: 90 to 120 PSI, Air inlet: 1/4''- 18 NPT