• Designed for the L5P Diesel engine with two tank caps
• One cap is located on the side of the tank (Vented) with right-hand threads
• The other is located on the top of the tank (non-vented) with left-hand threads
• GM designed this to eliminate any chance of installing the non-vented cap where a vented cap is required
• Compare to GM factory tool GE-52098-A
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