So I bought the wrong dosing pump and the Ebay seller does not allow returns(of course not) and I need to buy the right one. So I have to sell this one before I can buy the new one. My loss your gain right. Well it's a slave doser so if you dont already have jebao doser it wont work for you. It's a 4 pump system with a extra dosing head and a cable to connect to your current jebao doser. I paid $50 for it but only asking $40 looking to sell it fast as I need a doser.