Product Description
Lock down the rear core plug on your Common Rail Cummins. The INDUSTRIAL INJECTION PDM-08203 Rear Freeze Plug Back Plate Plug is a proven fix for the rear block plug on 2003–2018 5.9L/6.7L engines. This plate-style plug mounts at the back of the block to retain the existing freeze/core plug and help prevent coolant leaks in high-heat/pressure use. (No O-ring design.)
Fitment
- 2003–2007 5.9L ISB Cummins (Ram 2500/3500)
- 2007.5–2018 6.7L ISB Cummins (Ram 2500/3500)
What’s Included
- (1) Rear freeze/core plug back plate plug assembly (no O-ring)
- Mounting hardware as supplied by manufacturer
Key Features
- Back-plate retention for the rear block core plug to help prevent blowouts/leaks
- No O-ring configuration (simple, durable sealing strategy)
- Direct-fit for 03–18 5.9L/6.7L Cummins common-rail engines
Recommended Parts (CPP internal links)
- Industrial Injection PDM-07003 Side Freeze Plug (03–18 5.9L/6.7L)
- CPP Billet Rear Freeze Plug Back Plate (03–18 5.9L/6.7L) — Alternative
- Cummins 4938189 OEM Expansion Plug (03–18 5.9L/6.7L)
- Shop All Common Rail Freeze Plugs & Plates
Helpful Notes
- Rear plug access requires transmission/flexplate area clearance. Plan install time accordingly.
- Inspect existing rear core plug condition before reassembly. Replace OE plug if corroded or damaged.
FAQ
Does this part replace the rear freeze plug or retain it?This is a back plate that mounts over the rear freeze/core plug to retain it and help prevent movement or blowout under pressure.
Do I need an O-ring for installation?
No. This specific part number is a no O-ring design. Follow the manufacturer’s torque/cleaning guidance during install.
Will it fit both 5.9L and 6.7L?
Yes—this back plate fits 2003–2018 5.9L and 6.7L ISB Cummins engines used in Ram 2500/3500 trucks.
What else should I replace while I’m there?
It’s smart to address side/core plugs and any suspect OE expansion plugs while the transmission is out. See the recommended parts above for direct-fit options.
