NTC7161 - Coolant Expansion Tank Cap – 15 psi

- €6,60

€6,60

€6,60 - €6,60

€6,60

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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.

Coolant Expansion Tank Cap - pressure cap for the cooling system expansion tank, rated at 15 psi.

The cap seals the expansion tank and regulates system pressure: it holds the circuit at its working pressure to raise the coolant boiling point, venting through an integral relief valve once 15 psi is exceeded. As the engine cools, the vacuum valve allows coolant to be drawn back into the circuit, maintaining the correct system level.

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

Fitment Notes DEFENDER 1986-2006 — 2.5L TDi, coolant expansion tank pressure cap, 15psi
DISCOVERY 1 1989-1998 — TDi, 2.0L MPi Petrol and V8 EFi; 15psi
RANGE ROVER CLASSIC — TDi Diesel Turbo (1992-1994 from VIN JA610294); V8 EFi to (V) FA399972 and petrol engines from (V) MA647645; 15psi

Alternative Codes

NTC7161NTC7161ES

In stock 33 units

24 · Gouda 9 · 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 does the NTC7161 coolant expansion tank cap do and what is its pressure rating?

The NTC7161 is a 15 psi pressure cap for the coolant expansion tank. It seals the system and maintains rated pressure to raise the coolant boiling point, and returns overflow coolant back into the tank when the system cools. It fits Defender 1986 to 2006 (2.5L TDi), Discovery 1 (TDi, 2.0L MPi, V8 EFi), and Range Rover Classic (TDi and V8 EFi).

Why does the pressure rating of the coolant cap matter?

Fitting the wrong rated cap can cause premature coolant boiling on a system designed for higher pressure, or overpressure damage to hoses and the expansion tank on a system designed for lower pressure. Always verify the correct pressure rating for your specific model before ordering.

What are the signs that a coolant expansion tank cap needs replacing?

Signs include coolant loss with no visible external leak, steam from the cap area, or a hose that collapses as the engine cools. The internal rubber sealing washer hardens over time, causing the pressure valve to seat incorrectly. Caps are inexpensive and worth replacing during any cooling system work.