The GRACO DB4777 is a Husky 1590 air-operated double diaphragm pump with a 1-1/2" NPT standard port size. It features an aluminum center section, BN (Buna-N) seats, BN balls, and a BN diaphragm. This pump is designed for reliable, leak-free transfer of a wide range of fluids, including antifreeze, detergents, motor oil, and hydraulic fluids, within industrial and maintenance applications.

Key Features:

• Air-operated double diaphragm pump
• Husky 1590 SS, 1-1/2" (38.1 mm) NPT
• Aluminum center section, BN (Buna-N) seats, balls, and diaphragm
• Antifreeze, detergents, motor oil, hydraulic fluid, and other compatible fluids
• Available in ATEX configuration (not standard for all models)
• Patented, high-reliability closed center air valve
• Online serviceable air valve
• Epoxy-coated air motor for durability
• No seals required, eliminating risk of leaks
• Suitable for harsh environments and heavy-duty use

Applications:
Transfer of industrial fluids such as antifreeze, detergents, motor oil, and hydraulic fluids in mining, agriculture, manufacturing, and maintenance operations.

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, reliability, and compatibility with existing equipment.
• Ensure proper alignment of pump components during assembly
• Use compatible fluids as specified in the manual
• Regularly inspect and maintain the air valve and diaphragm for optimal performance
• Follow all safety guidelines and manufacturer recommendations for installation and maintenance