ERR4685 - O-Ring

- €0,40

€0,40

€0,40 - €0,40

€0,40

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

O-Ring for the engine cooling system thermostat housing.

This sealing ring fits the drain or filler plug on the thermostat housing, providing a leak-free seal within the engine cooling circuit.

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

Fitment Notes Engine cooling O-ring / sealing ring — thermostat housing plastic plug, radiator filler and drain plug.
DEFENDER 1987-2006 — 2.5L TDi (200TDi and 300TDi), 2.5 Tdi Non EGR (Gem). Radiator filler plug (TDi only, to VIN TA976035); thermostat housing plastic plug (300TDi)
DISCOVERY 1 1989-1998 — 2.0L 4 Cyl MPi T Series Petrol (radiator and cooling system); 2.5L 300TDi (to VIN MA081992), 2.5 Tdi EGR (Gem) — thermostat housing plastic plug
RANGE ROVER CLASSIC 1992-1994 — 2.5L TDi (from VIN JA610294) — thermostat housing plastic plug
RANGE ROVER P38 1994-2001 — 4.0L / 4.6L V8 Petrol — radiator drain plug

Alternative Codes

ERR4685NTC5171

In stock 59 units

52 · Gouda 7 · 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

Where on the engine does the ERR4685 O-ring seal on a Land Rover?

The ERR4685 is a cooling system O-ring used in TDi diesel and V8 petrol engines. It seals a coolant pipe or housing connection within the engine's cooling circuit. It fits the Defender, Discovery 1, Range Rover Classic, and Range Rover P38 (1994-2001).

Which engines and models use the ERR4685 O-ring?

This O-ring fits 200TDi and 300TDi diesel engines in the Defender and Discovery 1, and V8 petrol (4.0L and 4.6L) in the Range Rover P38. It also covers the Range Rover Classic TDi from VIN JA610294. The alternative code is NTC5171.

Should cooling system O-rings be replaced whenever a connection is opened?

Yes. Cooling system O-rings are typically replaced whenever the connection they seal is disturbed. A compressed or heat-set O-ring won't reseal properly and risks coolant weeping that can be hard to trace until the engine is fully warm.