603431 - Union Nut – M12

- €10,20

€10,20

€10,20 - €10,20

€10,20

OEM: Made by an Original Equipment Manufacturer. This part is made by an original equipment manufacturer or under their license, ensuring compatibility and quality.

Union Nut for the fuel pipe in the fuel delivery system.

This M12 union nut clamps a fuel pipe to its mating union or component port, drawing the pipe's flare or olive against the seat to form a fuel-tight connection.

Vehicle Model Land Rover Defender up to 2016
Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994
Land Rover Series 2 and 3

Fitment Notes DEFENDER 1987-2006 (to VIN WA159806) — Fuel pipe union nut (M12); 4-cyl carb petrol; V8 3.5L twin carb; 2.5L 4-cyl diesel
DISCOVERY 1 1989-1998 — Fuel pipe union nut (M12)
RANGE ROVER CLASSIC 1970-1994 — Fuel pipe union nut (M12)

Alternative Codes

603431

In stock 10 units

10 · Gouda 0 · Drachten

Express delivery available

When will my order arrive?

Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
Netherlands / Belgium / Germany: 2–4 working days.
Other EU countries + UK: 4–8 working days.
Outside EU/UK: delivery times vary — contact us for an estimate.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the M12 union nut for?

This M12 union nut clamps a fuel pipe to its mating union or component port in the fuel delivery system. It draws the pipe's flare against the seat to form a fuel-tight connection on the Land Rover Defender, Discovery 1 and Range Rover Classic.

Which Land Rovers does this fuel union nut fit?

This fuel pipe union nut fits the Land Rover Defender, Discovery 1 and Range Rover Classic with the M12 fitting. On the Defender it covers cars up to VIN WA159806. Confirm your fuel pipe uses the M12 union before ordering, since fuel unions come in several thread sizes.

What should I watch when fitting the union nut?

The M12 union nut fits easily, but the pipe flare and seat must be clean and undamaged to seal. After connecting fuel pipework, check carefully for leaks before running the engine. A cross-threaded or over-tightened nut can distort the flare and weep fuel.