The 40 GPM – D8R fertilizer injector from Dosatron International Inc. offers improved chemical resistant housing and enhanced UV resistance. It also allows injection of corrosive chemicals and features easy-to-adjust injection rates and easy-to-read graduated scales. The injector can inject fertilizers, pesticides and caustic chemicals with a flow rate of 2.2 to 40 GPM, an injection ratio of 1 to 500 to 1 to 50, and a pressure range of 2 to 110 PSI.