Hi - I am planning to make a dust separator for my vac and at the same time put is a series of 'plumbing' pipes around my shop to attach to each machine as I use it - I am only a diy'er so only use one or two, I was wondering if I put a screw cap on the ends of the pipe that is not attached to a machine at the time would the system work? or would the long pipework take all of the suck out of the system? Any ideas? cheers, Jinx