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LR186859LR - Water Inlet Tube – Thermostat To Hose

- €190,00
€190,00
€190,00 - €190,00
€190,00
Genuine Part
Genuine: Original manufacturer part. This product is the original part designed and produced by the vehicle manufacturer.
Water Inlet Tube - rigid coolant connector within the engine cooling circuit, joining the thermostat housing to the upper coolant hose.

It carries coolant between the thermostat housing and the flexible top hose, holding the connection on a fixed routing across the engine. Fitted to supercharged 3.0L V6 and 5.0L V8 AJ133 petrol engines.

The companion water outlet tube is LR186917; the two are normally ordered and renewed together.
Vehicle Model Land Rover Defender New 2020+
Land Rover Discovery 4 2010-2016 (L319)
Land Rover Discovery 5 2017+ (L462)
Range Rover 2013-2022 (L405)
Range Rover Sport 2014-2022 (L494)
Range Rover Velar 2017+ (L560)
Fitment Notes DISCOVERY 4 2010-2016 — 3.0L V6 SC Petrol (from VIN GA000001)
DISCOVERY 5 2017 ONWARDS — 3.0L V6 SC Petrol
NEW DEFENDER 2020 (L663) — 5.0 V8 AJ133 Petrol, Nitra build (from VIN M2000001)
RANGE ROVER 2013 ONWARDS (L405) — 3.0L V6 SC & 5.0L V8 Petrol (NA/SC/CDA)
RANGE ROVER SPORT 2014 ONWARDS (L494) — 3.0L V6 SC & 5.0L V8 Petrol
RANGE ROVER VELAR 2017 ONWARDS — 3.0L V6 SC & 5.0 V8 Petrol. Thermostat-to-top-coolant-hose water connector; order in pairs with LR186917.
Alternative Codes
LR186859LR

Available to order 2–3 weeks

Not currently in stock. Order now — typically ships within 2–3 weeks.

Need it faster? Contact us about express import (2–5 business days).

When will my order arrive?

This item is ordered from our supplier on request. Typical lead time is 2–3 weeks from order confirmation.

  • Netherlands / Belgium / Germany: 2–4 working days after dispatch.
  • Other EU countries + UK: 4–8 working days after dispatch.
  • Outside EU/UK: contact us for an estimate.

Need it faster? Express import available in 2–5 business days — contact us before ordering.

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 Water Inlet Tube used for?
The water inlet tube is a coolant connector that links the thermostat to the top coolant hose on the supercharged petrol engines. This genuine Land Rover tube carries coolant between the thermostat housing and hose, forming part of the engine's cooling circuit.
Which vehicles and engines does this tube fit?
This water inlet tube fits the Discovery 4 2010-2016 and Discovery 5 2017+, New Defender 2020+, Range Rover L405 2013+, Range Rover Sport L494 2014+, and Velar 2017+, with 3.0L V6 supercharged or 5.0L V8 petrol engines. Confirm your petrol engine before ordering.
Is this tube ordered on its own or with another part?
This water inlet tube is typically ordered in pairs with the matching thermostat water outlet tube (LR186917LR), since the two connectors are usually replaced together during cooling system work. Check whether your job needs both before ordering just one.
Why do these coolant tubes fail?
These coolant connector tubes typically fail when the plastic cracks or the seals harden and leak, causing coolant loss around the thermostat area. On the supercharged petrol engines, a weeping tube can lead to low coolant warnings, so a cracked tube is replaced to restore a sealed circuit.