● Smaller in Size and Lighter in Mass As indicated in the dimensional comparison presented below, the AR16 is smaller than the A16 (32 design). Also, the mass of AR16 is substantially lighter than the A16. ● Low Noise The noise level of AR16 has been reduced at full flow and full cut-off compared with that of the excellent A16 quiet pump. yuken piston pump ar 16 yuken pump price list