ERR4686B - Filler Plug – Brass

- €8,00

€8,00

€8,00 - €8,00

€8,00

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Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.

Filler Plug sealing the fill and bleed point of the engine cooling system, fitted to the thermostat housing and the radiator.

This brass plug closes the top-up and bleed port and maintains cooling system integrity under operating pressure on Tdi and V8 applications. It is sealed by O-ring ESR4685, which should be renewed each time the plug is removed.

Vehicle Model Land Rover Defender up to 2016
Land Rover Discovery 1 1989-1998 (L318)
Land Rover Discovery 2 1998-2004 (L318)
Range Rover Classic up to 1994
Range Rover Classic 1994-2001 (P38)
Land Rover Series 2 and 3

Fitment Notes Plug - drain / filler level, engine cooling system (radiator and thermostat housing)
DEFENDER 1987-2006 — Radiator (2.5 TDi Non-EGR / 4-cyl TDi); Thermostat Housing (2.5L I4 300TDi)
DISCOVERY 1 1989-1998 — Thermostat Housing, 2.5 TDi EGR (Gem) / 2.5L 300TDi (to VIN MA081992)
RANGE ROVER P38 1994-2001 — Radiator and cooling system, 4.0L & 4.6L V8 Petrol
RANGE ROVER CLASSIC 1992-1994 (from VIN JA610294) — Thermostat Housing, 2.5L TDi

Alternative Codes

ERR4686BERR4686607024ARA2404BR 3485BR 3485BNTC4609

In stock 16 units

10 · Gouda 6 · 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 cooling system filler plug used for?

The filler plug seals the fill and bleed point of the engine cooling system, fitted to the thermostat housing or radiator depending on the application. It closes the top-up and bleed port and holds cooling system pressure on Tdi and V8 applications.

Which Land Rovers does this filler plug fit?

This filler plug fits cooling systems on the Defender 1987 to 2006, Discovery 1, Range Rover P38 and Range Rover Classic. It is used on the thermostat housing or radiator depending on the engine, covering Tdi diesel and 4.0L/4.6L V8 petrol applications.

Does the O-ring need replacing when I remove the plug?

Yes, the plug is sealed by an O-ring that should be renewed each time the plug is removed. Reusing an old O-ring typically causes coolant seepage at the bleed point, so fit a fresh seal whenever you refit the plug.