Advantage: 3/4 inch or 1/2
1. Two size inlet and outlet. 3/4 & 1/2 inch. Easy to install.
2. Easy to control in long distance, able to connect with solenoid valve.
3. Quick to start, strong self-suction power.

RD series air operated diaphragm pumps' sizes vary from 3/8 to 4 inch inlet/outlet, The pump body is made of various material, including PP, acetal, PVDF, Al, SST, CI, etc, which with high quality and good-looking appearance, is very similar to Graco's, but much cheaper than it.