Quadrajet Idle tubes Press in. These tubes fit all Rochester Quadrajet and Dualjet carburetors. Press in idle tubes metering the amount of fuel allowed into the idle mixture. Sizes are in thousandths. For example # 26 has a .026 size orifice. These press in tubes are available in sizes ranging from .026-.040. The larger the size the more fuel allowed. You may choose your size from the drop down menu.
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