Two from the ANTI-FAQ:
What in heaven's name IS an ARB Locker and does it matter if I don't know?
An ARB Locker is a special cabinet in the rear of a Land Rover where the ARB is kept. Mainly for Military use, the ARB, or Automatic Re Breather, is used for deep wading. You may have noticed that the intake snorkels fitted to Land Rovers are about 12 inches above the crew's heads. Clearly the crew needs to be able to breathe as well. This apparatus is used to supply air to the crew under these circumstances. (Most ordinary 4x4 users do not need them.) [DO]
Why are Land Rover tailights full of water?
This, in fact, is a standard feature of the "City" model as opposed to the "County". The Solihull design team correctly identified the need for water-cooled brake lights for use in city environments where the brake light is on for extended periods. It can be ordered from most LR outlets, as can the top-up kit consisting of:
(a)One litre of Lens-Water
(c.) grease, dielectric. [ML]
ps - That dielectric grease works great. I smeared it on a finicky marker light socket and presto perfecto. Wicks