Mityvac 4050 Silverline Plus Automotive Kit Model 4050 This kit includes the premiere Silverline Dual Converter Pump, producing vacuum or pressure at the flip of a switch. With its compound gauge, vacuum and pressure can easily be read without having to change tubing or ports. This is a 'must have' tool for the serious mechanic. The kit also includes brake bleeding and automotive test accessories, the Mityfill Automatic Fluid Feeder, vacuum plugs, tubing, and our 110+ User's Manual organized in a durable plastic case