Robart Small Variable Rate Air Control Kit RB188VRRobart Small Variable Rate Air Control Kit 60~80e RB188VR This is a complete air control kit for use with any pneumatic operated (air) retracts. The kit includes: small air tank, 5 ft. red & purple air line, fittings, retaining nuts, variable rate control valve, fill valve, and fill fitting. The Variable Rate Control Kit is the "plumbing" for Robarts retracts used in . 60 . 90 sized aircraft. This air kit can be used for two gear or three gear