Dosatron Chemical Injector 11GPM 1:500 - 1:64. This unit is listed for parts because it does not have the bottom check valve and nut to connect to a line. It was working in late 2023 when removed from service. It will need a seal kit in the near future. This unit has the internals and the threads look pretty good. See pictures for condition of parts. Shipping will be USPS with tracking. If you have any questions feel free to ask.