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Replacement Spark Plug Adapter, 12mm - For Compression Tester # LST 20250 - Includes O-Ring 20540: Advance Auto Parts
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JEGS W80577: Compression Tester Spark Plug Hole Adapters | Set of 4 | 10 mm x 1.0 | 12 mm x 1.25 | 18 mm x 1.5 | Special 16 mm x 1.5 Ford adapter - JEGS High Performance
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