My Disco 1 and my 4.6 Range have a cap that screws on. These caps are actually a GM type cap and a locking cap is available in vented and non-vented that can be used on the D1 and the P38 Range Rovers. I bought mine at a real parts house not AZ or the likes. I think I paid about $15 for the cap.
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Larry K.
96 4.0 Discovery 1 ( 9 yrs )
96 4.6 HSE Range (3 yrs )
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