... 1rpm Product IntroductionThis product can be installed by YZ1515x,YZ2515x,DG-1 and so on four kinds of pump heads, with ... and material Functions and features1.applicable pump heads: YZ1515x,YZ2515x,DG-1 ,DG-22.two ways of changing flow speeds: by hand ... rate7.not suitable when used in the open air SpecificationsSpeed0.1 to 100 rpm, reversibleSpeed precision0.1rpmSpeed controlRotary encoded switch / ...