You can get Widget World in various configurations. I got mine with a 'So-Dash' which included a manifold & pressure gauge for use with a cornie although they are often used for basic barrels too.
Here's what I found out when I contacted Hop & Grape:
[quote:302af52a]To use the Widget system you would require a cylinder, stand and sodash unit. The Sodash unit incorporates a Pressure gauge which will show the pressure in the keg at any given time but with the danger that a small leak may empty the keg and cylinder of gas in a short time we recommend only attaching the cylinder when you wish to apply some gas. So after a session you can top up the gas pressure when you have finished with the cornie to the level you require.
[u:302af52a]Their Widget World Page[/url:302af52a][/u:302af52a]
In the end I ordered from Grape n Grain because I wouldn't have been practical to avail of the cylinder exchange by post. I can't remember the exact pricing but it wasn't too much more than Hop & Grape.
H&G prices in UK£:
CYLINDER STAND £2.99
CO2/NITROGEN CYLINDER £19.99 (REFILL £5.99)
I got both the CO2 and the mixed gas canisters. The CO2 is finished and I haven't brewed a stout yet so the mixed gas is untouched. I must get a refill for the CO2 as they're a handy alternative to the pub gas if you're taking the keg with you anywhere like a party/BBQ etc.
The kit also comes with 3 adapted bottle caps for PET bottles which you can use to carbonate the bottles.