The traditional air valve system we use is Impco. We are Impco Technologies oldest accredited installer. The Impco Air Valve System has been copied around ten times with varying degrees of success. Until this day, there is still no substitute for the reliability and quality of the genuine article.

The principal of operation of the Impco Air Valve system is the secret of its great success, it provides smooth progressive throttle response through the design of its constant depression theory, and this also gives superior converter life by the constant purging of any contaminated fuel.

Systems fitted use model specific aluminium induction tubes, pre-made wiring harnesses, laser cut brackets, integrated fuel gauges and automatic starting assistance using petrol to start the car while switched to LPG. The genuine Impco Duel Fuel System has been used over the years by most Australian vehicle manufactures as a factory installed and warranted accessory. These manufactures would include Holden, Ford, Toyota, Mazda and Mitsubishi.

Smithy's LPG & Automotive Services uses and highly recommends the use of this quality system in a wide variety of applications including domestic passenger cars, light commercials, and also in some custom applications ie. street machines, hot rods and custom vehicles including motorhomes that want to keep a traditional carby look.