I recently "upgraded" the return pump on my IM50 to the Orlushy DC5000 and it's been working great! Fits without issues. Minor adjustments to tubing to make it work, but overall I'm very happy with it. It's got a bunch of different settings but I keep mine on constant mode at 100%. I connected mine to a smart plug so I can customize my feeding time. It's not a fancy or name brand piece of equipment, but it has served me well for the past couple months.