In stock.
Genuine MG Rover new old stock item.  

Losing coolant without a trace? The first thing to try is a new expansion tank cap. They often fail, meaning they don't hold pressure and allow coolant to boil off.

Cheap caps don't tend to last - this is a tried-and-tested item we've used extensively on our own fleet for many years. 
We believe this is the best PCD100160 cap on the market! 

Fits all K4 K Series petrol and L Series diesel variants.

If you have a ZS180 or 45 V6, you need PCD000040 -