This repair manual is applicable to pump Models 411 & 481, 412, 413, & 483. All photos illustrate Model 412. ATTENTION: SAFETYWARNINGS: Read and understand all warnings before installation or servic-ing pump. OPERATIONALLIMITS:* Maximum Operating Pressure: 175 psi at Temperatures to 150OF (65.6°C) Maximum Operating Temperature: 225°F (107°C ...