OD of heater matrix pipes near battery

Spatula

A4 B6
Joined
Jan 18, 2013
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Location
North West, Macclesfield
Hi,

Does anyone know the actual OD of the heater matrix pipes? Everywhere I have seen say 3/4 inch piping will do it however I got a pair of calipers in there and it looks more like 1 inch (25.3 mm) although it is pretty awkward to get calipers in there so I could be wrong. Does anybody know actual size?

A4 b6 2.0 auto.

TIA!