Model  Pro - 551  Pro - 551(P)  Pro - 401  Pro - 401(P)  Pro - 201
 FLUID PRESSURE RATIO |  55 : 1 |  40 :1 | 20 : 1
 OUTPUT(GPM) |  2 - 1/2GMP |  1 - 7/16GMP |  2 - 1/2GMP | 4.5 (1- 1/8) GMP
 MAX.DISCHARGEPRESSURE |  4,950psi |  5,500psi |  4,000psi |  4,000psi |  2,000psi
 AIR PRESSURE RANGE |  40~90psi |  40~100psi |  40~100psi | 40~100psi
 MAX. PUMP SPEED
 (CYCLE/min)
|  50 |  60 |  60 | 60
 STROKE (mm) |  120mm |  120mm |  100mm
 DIMENSION(cm) |  120 x 75 x 160 |  60 x 40 x 145 |  76 x 752 x 140 |  60 x 40 x 145 |  60 x 40x 130
 CONTAINER SIZE (gal) |  55gal |  5.5gal |  5.5gal |  5.5gal |  5.5gal