ERR4686 Thermostat Housing Plugs Set of 10

Refresh your cooling system service kit with this Thermostat Housing Plugs Set (Part No. ERR4686). Supplied as a set of 10, these plugs seal the thermostat/water outlet housing ports and associated coolant galleries, helping prevent leaks and maintaining stable operating temperatures. Built to OEM specifications for a precise fit and reliable sealing performance—ideal for routine maintenance, overhauls, or replacing aged and brittle originals.

 

Fits:

• Land Rover Series I–III (various engines)

• Defender 90/110/130 (applications vary by engine)

• Discovery I & II (1994–2004)

• Range Rover Classic (1987–1995) & P38 (1995–2002)

Always verify part number against your VIN or existing component when servicing mixed-year builds.

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FAQ

What exactly is included?
Ten (10) thermostat/water outlet housing plugs—enough for multiple services or spares.

Do these require sealant?
Use a light, non-hardening thread/cooling system sealant if specified by your workshop manual; do not overtighten.

Are these compatible across petrol and diesel engines?
Yes—ERR4686 is used across various Land Rover petrol and diesel applications listed above. Confirm against your VIN for certainty.

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Part Number: ERR4686

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