Perfect Fit: Diesel Compression Test Adapt Adapter uses with STAR Diesel Compression Tester TU-15. Compatible with GM: Duramax 6.6L Turbo Diesel (2005-present). Also works on a Duramax LML engine. LNG-TU-15-38 Diesel Compression Test Adapt Adapter for Duramax, M10 x 1.25 mm.
