For 2011 and up F-Series Diesel Engines. Use glow plug holes as test ports. Thread is 8mm - 1.00. 1/4 NPT Fitting. 1 Tester Adapter Hose. Model: Suitable for F-250 6.7L 201 - 2021; for F-350 6.7L 2011 - 2021; for F-450 6.7L 2011 - 2021; for F-550 6.7L 2011 - 2021; for F-600 6.7L 2020; for F-650 6.7L 2016 - 2019; for F-750 6.7L 2016 - 2019.