The GRACO DC3977 is an air-operated double diaphragm pump with an aluminum center section, polypropylene seats, Buna-N balls, and Buna-N diaphragms. It is designed for industrial fluid transfer applications, offering robust construction and compatibility with a wide range of fluids.

Key Features:

• Air-operated double diaphragm pump
• Husky 1590, 1-1/2" NPT
• Aluminum center section, polypropylene seats, Buna-N balls, Buna-N diaphragms
• Maximum flow rate: 100 gpm (378.5 lpm)
• Maximum discharge pressure: 120 psi (8.4 bar, 0.84 MPa)
• Compatible with asphalt sealer, antifreeze, detergents, motor oil, hydraulic fluid, cutting oil, water, and wastewater transfer
• Patented, high-reliability closed center air valve (online serviceable)
• Epoxy-coated air section for tough environmental conditions
• Lube-free operation
• Easy-to-service air valve and ball checks
• Compact, portable size

Applications:
Industrial fluid transfer, including asphalt sealer, antifreeze, detergents, motor oil, hydraulic fluid, cutting oil, water, and wastewater transfer

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, reliability, and safety of the pump system.
• Ensure correct alignment of inlet and outlet connections (1-1/2" NPT)
• Use appropriate thread sealant for leak-free installation
• Verify air supply pressure matches pump requirements
• Regularly inspect and maintain air valve and ball checks for optimal operation
• Periodically check diaphragms, balls, and seats for wear or damage
• Clean pump internals as needed to prevent clogging or contamination
• Follow manufacturer guidelines for replacement intervals of wear parts