Impco Model CT425 Mixer

The CT425 is a high-capacity air-gas mixer / carburetor from the IMPCO Model 425 family. It’s designed for LPG vapor or natural gas vapor service, delivering robust performance for large engines. The “CT” (“tamper resistant”) version includes tamper-proof idle adjustment and other features suited for regulated or performance-sensitive installations.

Key Features

• Single-diaphragm air-valve carburetor/mixer design

• Down-draft air inlet configuration (available air horn / remote filtration)

• Tamper-resistant version (idle adjustment sealed) for regulated or restricted applications

• Suitable for LPG vapor or natural gas vapor fuels

• Standard diaphragm material is Hydrin; silicone is optional for higher heat or chemical resistance

• Designed for vertical mounting

• Wide operating temperature capability (sub-zero through hot engine bay conditions)

Specifications

Applications

• High power vehicle or industrial engines (LPG/Natural Gas) requiring high flow and reliable mixture control

• Situations where tamper-resistant settings are needed (e.g. regulated emission zones)

• Retrofits, performance or custom engine builds with large displacement or multiple cylinders needing a large carburetor capacity

• Cold weather / variable temperature environments where material choices and robust diaphragm performance are critical

Why Choose IMPCO CT425

The CT425 gives you a heavy-duty mixer/carburetor option with high flow capacity, durable design, and tamper-resistant features. It’s built to deliver strong output at both typical and elevated manifold depressions, with flexibility in material and air inlet options. If your engine needs a large, dependable air-gas mixture unit for LPG or NG vapor under demanding operating conditions, this model fits well.