yes, remove the wading plugs when not wading

I saw wading kits for around £24 on ebay, as I remember, they had plugs aswell as extended breather pipes and the unions to fit it all.
Also, try southdown4x4 for a snorkel, they do one a little cheaper then safari which sits on the top of the wing next to the A Pillar, and made of stainless. once it's in the engine bay, it's just a flexitube and fittings to your airbox.