Don't let a blown freeze plug cause your 2003-2018 Dodge 5.9L and 6.7L Cummins to overheat, fix the issue before it happens with the XDP Cummins Bolt-On Rear Freeze Plug XD339. Hard acceleration, increased engine RPM, and temperature differences in your cooling system can cause the rear freeze plug to blow out. Not only can a blown out freeze plug leave you stranded, it also causes large coolant losses that lead to overheating conditions. The XD339 Bolt-On Rear Freeze Plug fastens securely to your engine block using existing bolt holes. Each freeze plug is machined from 6061 aluminum and features a built-in o-ring for a leak-free seal. This freeze plug does not require transmission removal for installation and is pre-drilled and tapped to 1/2" NPT to work with most coolant bypass kits (1/2" NPT plug not included) Compatible With: *May not work for all builds due to other engine/vehicle modifications [row] [col span__sm="12"] Frequently bought with: [products ids="454786,4355,3978187,302431"] [/col] [/row]