Womala Water Manifold Plug LR011038 for Land Rover LR4 Discovery 5 Range Rover Sport

Product Overview

The Coolant Bleed Blanking Plug LR011038 is an OE-grade cooling system component engineered for the 3.0L V6 supercharged and 5.0L V8 petrol engines (AJ126 / AJ133) in select for Land Rover vehicles. Also known as a water manifold plug, bleeder plug, or bypass hose blanking plug, this component seals the highest point of the cooling system on the water manifold/crossover pipe . Its primary function is to allow technicians to bleed trapped air from the cooling system during coolant service, while also sealing the manifold under normal operating pressure .JDE33172 is the Jaguar equivalent part number for the same plug .

⚠️ Important: The factory plastic plug is known to become brittle and crack due to constant heat cycling. When it fails, it causes coolant leaks at the top of the engine, low coolant warnings, and — critically — the plug head can crumble when a technician attempts to loosen it during service . Upgraded versions with brass or reinforced construction are available as a permanent fix.

Key Features

• Bleeds trapped air – allows air pockets to be vented from the cooling system during coolant refill 

• Seals the water manifold – maintains cooling system pressure and prevents coolant loss 

• Integrated O-ring seal – provides a tight seal without additional sealant 

• OE-grade quality – available as Genuine Land Rover, Britpart, and quality aftermarket alternatives 

• Known failure point – factory plastic plugs become brittle with age and can break during removal 

OE Cross-Reference

💡 Note: LR011038 is the Land Rover part number; JDE33172 is the Jaguar equivalent for the same plug .

Technical Specifications

Vehicle Fitment

Engine details (verify with VIN):

• 3.0L DOHC GDI SC V6 Petrol (AJ126)

• 5.0L OHC SGDI NA/SC V8 Petrol (AJ133) 

⚠️ Important: This plug is for petrol engines only — 3.0L V6 supercharged and 5.0L V8. Not for diesel variants.

Signs of Failure

• Coolant leaks – orange/pink coolant residue around the water manifold or top of the engine 

• Low coolant warning – recurring dashboard alerts requiring frequent top-ups 

• Brittle or crumbling plug – plug head breaks during removal, leaving threaded body stuck in the manifold 

• Engine overheating – coolant loss causing temperature issues

💡 Critical Service Note: The factory plastic plug becomes extremely brittle over time due to continuous heat cycling . If a technician places a screwdriver on the plug and applies light pressure, the head can crumble, leaving the threaded body stuck in the pipe. A coolant leak at this location, if not caught in time, can lead to coolant depletion, overheating, and head gasket failure . Professional garages always recommend replacing this plug preventatively whenever the water pump, thermostat, or Y-pipe is serviced .

Critical – Verify Your VIN Before Ordering

Bleed plugs are engine-specific. Provide your VIN – our team confirms exact compatibility before dispatch. We cannot accept returns for misordered parts without VIN verification.

💡 Installation Tip: Professional installation recommended. This is a plastic component — do NOT overtighten. Tighten by hand or to the very low torque specification. Overtightening will snap the cross-head immediately or crack the radiator pipe below . The plug includes an integrated O-ring seal and does not require additional thread tape . When refilling coolant, use a 50% antifreeze mixture and bleed the system thoroughly .

Why Choose Us

Contact us for bulk orders or VIN‑checked quotes.

Specifications subject to change; images for reference only.Aftermarket replacement – not affiliated with Jaguar Land Rover.

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