This small scale filler allows you to fill all piston type cans through the rubber grommet on the bottom. It can be attached to a burette filler for propellant filling or directly to a regulator for nitrogen. It has an fine adjustment on the column for accruate filling on different size cans. Comes complete with toggle valve. & 0-100psi, 3" Test Gauge with an accruacy +/- 0.5 psi. Certificate of accuracy supplied. Calibrated & tracable to N.I.S.T.