It appears to be water proof as I have not noticed any water inside the casing and the blue plugs and sockets are made for outdoor use and so just need protecion from direct rain I would have thought
Usually I make any connection under the caravan and off the ground
I bought it from a caravan dealer
Hi again
I just got it from the garage and it has black rubber sealing all round the opening and at each end where the cables go in
Its made to take the blue standard caravan plugs and sockets
http://www.caravanpartsaccessories.co.uk/index.php?main_page=product_info&cPath=19_20&products_id=244&zenid=ev60sv8ibnapqnatk7qkkegth6
Also I copied this from the Crusader website
Its the same thing but the pics didn't copy
WATERPROOF CONNECTION
PROTECTOR
RCD
SAFETY PLUG
UK/WORLDWIDE
ADAPTOR PLUGS
Mains Tester ..................................J460 Connection Protector................... V890 RCD 240v Safety Plug ..................J436
A folding waterproof protection
chamber for ensuring a safe
240v site plug/coupler
Its about 4 pages down here
http://www.crusaderproducts.co.uk/files/ww/Electrical%20-%20Accessories.pdf