#1 Home Improvement Retailer

Internet # 100026900

Model # CDU790

1/3 HP Cast Iron Submersible Sump Pump with Vertical Float Switch

Apply Now
Pay $121.48 after $25 OFF your total qualifying purchase upon opening a new card. info
Apply for a Home Depot Consumer Card
  • Pumps up to 4600 GPH at 0 ft.
  • Rugged, submersible cast iron base and metal construction
  • Top suction design filters debris and minimizes clogging
  • View More Details
Free & Easy Returns In Store or Online
Return this item within 90 days of purchase. Read Return Policy
Product Details

About This Product

Wayne's CDU790 features a durable cast iron base and epoxy-coated housing for long life and quiet operation. This submersible pump is designed for 11 in. or larger sump pits. The CDU series is one of the most popular replacement pumps in America. The ceramic mechanical seal assures long life in the most demanding applications and the 1-1/2 in. discharge allows easy installation plus maximum flow.


  • Submersible cast iron and coated steel sump pump with vertical float switch
  • Top suction pump design eliminates air locks and clogging from debris in bottom of sump pit
  • Epoxy-coated steel motor housing and rugged, cast iron pump base
  • Fully submersible
  • 1/3 HP; max. flow rate is 3800 GPH; 2700 GPH at 10 ft. of discharge lift
  • 1-1/2 in. NPT discharge
  • For use in 11 in. Dia or larger sump basins; 9 in. on level and 4 in. off level
  • On 9 in. - off 4 in.
  • Assembled in the U.S.A.
  • Click here for more information on Electronic Recycling Programs
  • Return Policy

Product Information

Internet # 100026900

Model # CDU790

Additional Resources

Shop All Wayne


Dimensions: H 14 in, W 10 in, D 10 in


Product Depth (in.)

10 in

Product Height (in.)

14 in

Product Width (in.)

10 in

Switch-Off Height (in.)


Switch-On Height (in.)



Amperage (A)

3.7 A

Cord Length (ft.)


Discharge Flow @ 0 ft. (gallons/hour)


Discharge Flow @ 0 ft. (gallons/min)


Discharge Flow @ 10 ft. (gallons/hour)


Discharge Flow @ 10 ft. (gallons/min)


Discharge Flow @ 15 ft. (gallons/min)



Non-Clogging, Submersible

Housing Material


Impeller Material

reinforced poly carbonate

Maximum Horsepower (hp)


Maximum Pressure (PSI)


Maximum Working Temperature (F)


Minimum Sump Basin Diameter

11 to 14

Minimum working temperature (F)


Outlet Diameter Connection (in.)

1-1/2 FPT

Pack Size


Power Type Required


Product Weight (lb.)

16.95 lb

Pump Switch Type




Vertical Lift (ft.)




Warranty / Certifications

Certifications and Listings

cUL Listed

Manufacturer Warranty

3 Year Limited Warranty

Questions & Answers

Q:This pump is listed with a 3.8 amp draw, is that with or without a load?
by|May 11, 2024
1 Answer
Answer This Question

A:  This is the running amperage on your pump

by|May 13, 2024
    Q:Can I plug this to the Anker Solix C1000 with output power of 1800W (2400W Max) 1056Wh as battery backup?
    by|Apr 21, 2024
    1 Answer
    Answer This Question

    A:  We have not tested our pumps on any generators; therefore we cannot recommend this as an option. Here is the statement from our Engineers: Generators develop an AC voltage that is not as clean as the voltage received from their power company. Electrical devices such as pumps, computers, TVs, and other sensitive electronics can be damaged if the Total Harmonic Distortion (THD) is too high…typically below 5% is acceptable and provides a safe voltage. The THD is a measurement that shows how far a signal’s waveform departs from a pure sine wave.

    by|Apr 22, 2024
      Q:A previous answer said not for outdoors. Why not? I have a sump pump pit and plan to put pump into a mesh bag to help protect it from debris.
      by|Apr 4, 2024
      1 Answer
      Answer This Question

      A:  The UL rating on this pump is rated for indoor use only.

      by|Apr 8, 2024
        Q:I have a whole in my cellar floor with sub pump is old float doesn't work so it has to stay plugged in. with flexible hose going out to side yard. Need to replace asap. Can't be more than 9" w What are my.options?
        by|Mar 29, 2024
        1 Answer
        Answer This Question

        A:  The actual diameter of the pump is 9 1/2 inches wide, but we recommend at least an 11-inch-wide pit for possible vibration of the pump.

        by|Apr 3, 2024
          Showing 1-4 of 106

          Customer Reviews

          4.8 out of 5

          • 4.8 out of 647 reviews
          • 96% recommend this product
          Filter by:
          Showing 1-10 of 647 reviews
          How does the song go, "seems it never rains in Southern California, but girl, let me warn ya, it ...
          How does the song go, "seems it never rains in Southern California, but girl, let me warn ya, it pours, man it pours”. We can get a lot of rain when the storms roll through, and some of it was beginning to flood our backyard and patio. Did a lot of research on the best pump, and liked the construction details, production tests, and warranty for this pump. Using it for our backyard drainage, it didn’t need to be the largest, and it has proven itself to be perfect for my intended usage. I installed a collection box at what was the lowest part of our yard (also from Home Depot, U.S. TRENCH DRAIN 18”x14” Storm Water Pit and Catch Basin for Modular Trench and Channel Drain Systems with Aluminum Grate), an Everbuilt Sump Pump check valve, and then ran 1 1/2” ABS out to an ABS drain line under our driveway, and continued that run down slope to off the curb. Anchored this box deep down with 10” lag screws through the box sides sideways to eliminate potential for the box to be floated by water. Placed the pump inside, where fit and room was perfect. As stated, this pump works perfectly for its intended use. Rain water runoff accumulates quickly in the box, the float rises as it fills and in less than 2 seconds the box is emptied. Over and over and over. I have stood in the rain and watched it repeat this action effortlessly as the rain pours down. It’s a pleasure to watch a project succeed in its purpose, and have a dry patio. I have the pump plugged into a waterproof passthrough into the house, with a portable GFCI at the outlet. The pump is quiet, efficient, feels very well built, is solid, and has good heft. The most I have heard is a low hum when it activates. It has given us a lot of peace of mind now knowing that we won’t wake to a flooded patio when it rains heavily overnight. I realize we have only started the rainy season as of this writing, but right now I am very satisfied with this purchase.
          • Verified Purchase
          • Recommended
          12 found this review helpful
          Wouldn't recommend Wayne pumps if you want one to last more than a couple of years. Installed one...
          Wouldn't recommend Wayne pumps if you want one to last more than a couple of years. Installed one of their 1/3 hp pedestal sump pumps a few years ago in my mothers basement. It lasted about 2 years before the shaft rusted to the cast iron and it stopped working. Replaced it with another brand and threw the Wayne off to the side until a few days ago when I brought what was left of it home so I could at least harvest the motor off of it and throw the rust pile away. Total JUNK!
            11 found this review helpful
            It's hard to rate something that you will depend on for long term durability when just installing...
            It's hard to rate something that you will depend on for long term durability when just installing it. Just 4 stars for that reason. However, it was easy to install and is extremely quiet.
            • Verified Purchase
            • Recommended
            4 found this review helpful
            Great sump pump! I was amazed at how quiet it is. It has my recommendation
            Great sump pump! I was amazed at how quiet it is. It has my recommendation
            • Verified Purchase
            • Recommended
            1 found this review helpful
            My previously installed Wayne sump pump was still functioning ok but, not being sure how old it w...
            My previously installed Wayne sump pump was still functioning ok but, not being sure how old it was, I decided to replace it a month ago for peace of mind reasons. The choice as to what to replace it with was easy to make - the same thing. I have about a ten foot lift to get the water out of the basement. The pumping power of this pump is more than adequate. I like the quality of cast iron construction. The vertical float switch design allows it to fit well into my sump pit and the float "guard" ensures that the pump cannot get close enough to the wall to interfere with the float. It is also very quiet. A great quality product. More than meets expectations.
            • Verified Purchase
            • Recommended
            7 found this review helpful
            I'm Pumping. Great Product.
            I have a low spot in my yard that ponds during heavy rain. I researched putting in a sump pump by watching on-line videos. I installed a 6" catch basin in the area and plumbed it to a Home Depot bucket, buried a few feet away, with 4" PVC pipe. The bucket was buried a few inches below the surface. I increased the height of the bucket by cutting off the bottom 4" of another bucket, and placing the top into my buried bucket. The buckets were attached to each other with screws. I bought the Wayne 1/3 HP Sump Pump and a check valve on line from Home Depot. I wanted a pump with a vertical float switch. I had earlier purchased another pump (not from Home Depot) with a tether float and couldn't get the float to work properly. It had to fit in my bucket sump. Wayne products had good reviews and appeared easy to install. Both items arrived quickly and were well packaged. The instructions were easy to read and understand. I purchased a few fittings and connected the check valve to the pump. I placed the pump into my bucket sump and then plumbed 1 1/4" pipe from it to a v-ditch on the side of my yard. I capped the sump bucket with a bucket lid. This set up worked great during a test. It is very quiet. The real test came with the heavy rains we received the past week. It has continued to work flawlessly.
            • DIY
            • Verified Purchase
            • Recommended
            16 found this review helpful
            Looks to be well built and is American made.
            Less than one month after receiving and installing this pump is too early to rate this but HD insists. It arrived on time, looks well built and was easy to install. Whether it will last and perform well only time will tell. It is American made.
            • Verified Purchase
            • Recommended
            17 found this review helpful
            High Quality Pump at a Great Price
            I've had three other sump pumps prior to this one. One of them was guaranteed for life, but various parts failed on it such that I replaced it three times in three years prior to its latest failure. I selected this pump based on the reviews and had it shipped overnight because my basement was getting very wet with a failed sump pump. It was tempting to go with something in stock that I could just go pick up, but the reviews on those available were mixed. The quality appears to be very good and installation was easy. The float switch works very well and has a perfect length of travel even in my fairly shallow sump pit. The issues I read about do not seem to be major compared to the other types of failures that I've had. For example, if the float rod rusts out it will be easily replaceable with a rod made of better material. I had been worried about noise based on one of the reviews, but this pump is not very loud. I have it in an unfinished basement with no insulation between the first floor joists and do not really hear it on the first floor. It is almost as quiet as my 12V backup sump pump and no where near as loud as a previous pedestal pump I had that made all sorts of noise. It is much much quieter than my oil furnace that is nearby that runs more often. I will provide an update in the future if I have some sort of failure or in a few years if it is still working well.
              • Recommended
              35 found this review helpful
              • Verified Purchase
              • Verified Purchase
              Showing 1-10 of 647 reviews

              Compare Similar Items

              current item

              Housing Material




              Stainless steel






              Impeller Material

              reinforced poly carbonate

              Stainless steel impeller


              Cast Iron