Well peeps I haven't raised enough cash to get the RICA unit I'm desperate to own so I'm going to opt for a MBC for the time being.....

I'm trying to get info on how they work....

Does the tuning dial screw in to close the valve or hold it open..?
Does the valve work on pressure or vacuum..?

Have people seen the brass one on Eaby for £22.99?
Is it true that the brass one will be more reliable than the steel one?
Is the price a good price?

I did have a thought could I get one from a hydralic suppliers etc..and would it be cheaper?

anyway any info would be good...?