Yost Performance CV40 Master Kit - Rev 1 Yost Power Tube PTR1 A fuel atomizing device which provides a noticeable increase in power and a smoother running engine Installs in less than 10 minutes Comes complete with the emulsion tube, New Rev 1 Yost power tube (press fitted into emulsion tube), blue and red needles, compression spring, 1/8in. and 7/64in. drill bits, 165, 175, 185, 195 main jets and washers