Designed to inject chemicals with every stroke of the pump and apply at up to 1500 PSI. Designed to mount to the valve port of many different General Pump models. Construction is 303 Stainless Steel with Buna diaphragm. Inlet and outlet are 1/8" FPT, pulse port is 1/4" FPT. To convert existing pumps, one adapter and one valve assembly is also required from the chart shown.