My advice is don't buy cheap tools. Tyre better off with something like this:

http://www.ebay.ie/itm/SEALEY-VS820-BRAKE-AND-CLUTCH-BLEEDING-SYSTEM-TOOL-/360994784441?pt=LH_DefaultDomain_3&hash=item540cf7 44b9

I have one for a few years & it makes the whole process truly a one man job.