Well I managed to get another rotokeg from ebay for £6, which said it had the float etc included. I think that these type of kegs need gas injected to make them work, otherwise how does the top tap float work?? If so do you think I need a gas injector fitting for the cap?? There is a wee hole in the bung which may fit a needle valve type thing (such as the one's put into a football & handpump?)
Here is a piccy of the float & tap system, maybe someone has used this type before?? It's basically a tube stuck into a float & secured to the back of the tap!!
Here is the original rotokeg I got from the recycling yard. I bought a float & tap from the-home-brew-shop.co.uk & an o ring for a king keg (which is a perfect fit) all for about a tenner. The float is different & again I think it will need gas to work properly, but this keg has an attatchment on the cap which looks like it's for a gas canister. I think this system looks much better & I may get the same again + a cap fitting for the gas, to replace the other one.
If anyone has an idea on these type of kegs, I'd appreciate if you could let me know - especially regards to drawing from the tap. I can't imagine that you have to set off a syphon effect, or how you would do that anyway??
Cheers Guys.