1" is a specialized sealing component designed for use in various fluid handling systems

041 Maximum Working Pressure (kPa) 34500 Maximum Working Pressure (psi) 5000 Maximum Working Pressure (bar) 345 Type Spray Tip Maximum Fan Width (in) 8 Maximum Fan Width (mm) 254 Spray Pattern Fan Tip Type Airless Pattern Size (in) 8 to 10 Maximum Flow Rate (GPM) 1

The difference between the two is that the #4 allows for more fluid output

The D4964 6" Face Plate is threaded to 1" x 8 TPI for wood lathe turning

4-1/2" Mounting Size 7/8"

Graco TE120-0213 QUANTM i120, 2"NPT, Aluminum Electric Diaphragm Pump, 200-240 V, AL Center, TP Seat, TP Ball, TP Diaphragm 24V DC 1/3 HP Reversible 1" is a specialized sealing