Chem-Tech Series 300 line are completely self-priming hypochlorinators/metering pumps. These models are designed to withstand the rigors of constant pumping. The mechanical components of the pump assembly are guaranteed lubricated to minimize wear. The diaphragm pumping mechanism is reinforced with metal and fabric to ensure resistance to aggressive chemicals pumped. The wet end parts that handle the chemicals are all made with corrosion resistance. To further ensure durability and long life usage, the body of the pump in housed in heavy duty plastic. The heavy duty speed reducer comes complete with an oil sight gauge. Various stroke rates are available to suit almost any application. Output is adjustable from zero to maximum capacity without having to shut down the system.