DNJ
DNJ Expansion Plug Kit 1997-2008 Ford, Mercury 4.2L
DNJ Expansion Plug Kit 1997-2008 Ford, Mercury 4.2L
Part number: FPS4123
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- Tracking emailed when it ships
- Free fitment check before you order
Listed for: 1997β2008 Ford and MercuryFitment notes & questions
Expansion Plug Kit from DNJ, listed for the 1997β2008 Ford and Mercury with the 4.2L engine. Thread type and size must match on both sides; AN, NPT and metric threads do not mix. Part number: FPS4123.
Key features
- DNJ Brass Freeze Plug Set
- Made for VIN 2 N/R 12V OHV engines
- Listed for V6 4.2L 256 OHV 12V engines
Specifications
- Brand: DNJ
- Part type: Fitting
- Part number: FPS4123
- Engine: 4.2L
- Engine code: VIN 2 N/R 12V OHV
Fitment for the 1997β2008 Ford and Mercury
- Years: 1997β2008
- Vehicles: Ford
- Cylinders: V6
- Displacement: 4.2L
- Engine: 256 OHV 12V
- Engine codes: TRITON
Check your year, model, engine and trim against this list before you order.
What it does
Fittings and hardware connect lines, hoses and parts securely. The right fitting, thread and size keeps a connection sealed and secure, which matters most on fuel, oil, coolant and brake lines.
Installation & tips
- Confirm thread type and size on both sides, and use the right sealant or none as the fitting type requires.
- Hose: Match hose size to the fitting.
- Put the new part next to the old one and compare the shape, mounting points and connections before you install it.
- Work on a cool engine with the vehicle secured, and use a service manual for your vehicle for torque specs and procedures.
FAQ
What is the part number of this expansion plug kit?
FPS4123 (DNJ). Compare it with the number on your old part or in your parts catalog.
Which engine is it for?
It is listed for the 4.2L VIN 2 N/R 12V OHV engine in the 1997β2008 Ford and Mercury. Check the engine code on your vehicle if it was offered with more than one engine.
Can I install it myself?
Many owners do this job at home with basic tools and a service manual for their vehicle. If you are not sure, have it fitted by a qualified mechanic.
Before you order
- Confirm your year, make, model, engine and trim match the fitment listed above (1997β2008 Ford and Mercury 4.2L).
- Compare part number FPS4123 with your original part.
Good to know
- Warranty: 12 month or 12,000 mile warranty whichever comes first. Warranty must be requested by the original purchaser and is limited to the replacement of the alleged defective part(s) only.

DNJ fitting or hardware for the Ford and Mercury: what to know
Thread type and size must match on both sides; AN, NPT and metric threads do not mix.
Fitment notes
- Listed for: 1997β2008 Ford and Mercury.
- Model years: 1997β2008. Check your car's year falls inside this range.
- Engine: match the engine size and code to your vehicle; the same model often came with several engines.
- Specs, lead time and warranty come from DNJ and can change. The details above this guide are the latest we have.
Not sure it fits? Send us your year, make, model, engine and trim and we'll check before you order.
Ask about fitmentWhat else to plan for
- Hose. Match hose size to the fitting.
More for your car: Mercury Parts Β· Ford Parts Β· Fuel & air intake
Questions about Ford and Mercury fitting or hardware
Will this fit my Ford and Mercury?
Does it need thread sealant?
Where do specs and warranty details come from?
Questions & answers
No questions yet about this part. Ask about fitment, what's in the box or installation and we'll answer here.