What to use for diesel filler cap seal?

[Murv]

As title really! Mine look a bit tired, what's the best material to use to make some new ones?

 

[omega2]

POND LINER and scissors

 

[Medway Mudlark]

If its a flush fit that needs a key to open, is there not an o ring on the cap part of the fitting?

 

[Momac]

http://www.seabridge-marine.com/O_Ring_for_deck_fills/p2023673_10923690.aspx

.

 

[superheat6k]

Nitrile, Bhuna or Neoprene rubber sheet, bout 2mm thick.

 

[Murv]

Excellent, thanks all