As far as I'm aware there are no featherweights that use this method anymore (at least there weren't at the last 3 champs). Yet another very old school method :rofl:
The best way to build a low pressure system is to use a standard high pressure container attached to a regulator. I believe trevor regulators are the standard these days although I'm sure one of the pneumatics guys can fill in this detail.
For fittings, http://www.technobotsonline.com/pneumat ... -fits.html
