BERKEBILE 2+2 Instant Gum Cutter keeps well-maintained engines working better and lasting longer. BERKEBILE 2+2 Instant Gum Cutter reduces harmful emissions and can increase fuel economy which puts more $ in your pocket and less in fuel and costly repairs. Cleans Automatic Chokes, Carburetors, Choke Linkages, and PCV Valves & Hoses! Removes Varnish, Gum, & other Deposits Instantly! Oxygen Sensor Safe! Extension Tube Supplied for Pinpoint Application!