Quieter Pumps: For Low-Noise Environments. The Silent Pac Pump Unit is a portable diesel-powered pump able to operate quietly for environments where low noise levels must be maintained. It produces only 70 decibels at 23 feet, and is well-suited for sewer bypass operations. The pump has easy-access doors for regular maintenance, and is available in several models, depending on the type of job. Griffin Pump & Equipment, Inc.; 713-671-8157; www.griffinpump.com
