What is it called and who might sell me one?

P4 110 (with P5 mark 3 engine but it’s basically the same): the large rubber O ring that goes at the back of the metal housing that the air filter sits in, between it and the air intake elbow. It’s about 4” in diameter. What the hell is it called? I’ve scoured the websites of the usual suppliers and found no reference. Thank you, A
 
Is it an O-ring or like part 603069, a short sleeve as used on P6b intake? If really an Oring try a decent engineering shop - take along the part it fits on to is easy.
 
Thank you, yes, it is just a simple o ring. I’ve ordered some based on size, on the basis that it doesn’t have to be an exact fit. Regards, A
 
IIRC O-rings are described using their ID and cross section - eg the reserve tap one is a 9x2mm.
 
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