I bought the GXP33C to replace a Moen GXP50C that I had purchased 6 years ago. This model's overall diameter is less than the GXP50C so its installation was easier in the space available under the sink. I was pleased that the discharge connection was the same diameter and location as the GXP50C so I just reused the existing fittings and pipes. The 1/3 HP is more than adequate.