I've heard a number of unconfirmed issues about Airtec snorkels, they fabrication, UV rating etc. Like I said unconfirmed so I don't know how reliable these tales are.
What I can tell you from personal experience with an Airtec is they are not necessarily the same diameter for the air ram and in fact for the Defender (yes I know you mentioned Disco) it isn't a standard air intake diameter.
The Safari is in my opinion a better made unit and it is also the OEM snorkel for LR in Australia.
MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
Bookmarks