My Hydro Floss pump was weak. I reviewed the video on the ToothyGrinsStore site. Based on the video, I decided that I could replace the pump myself.The parts arrived within 3 days via USPS. The packing was done very well and the parts were undamaged upon arrival. David was very helpful and patient when I called about a missing part. Turns out, he was right. I had thrown the part out with the packing peanuts. Yes, my Hydro Floss works perfectly now!David, thank-you again.