#1 Home Improvement Retailer

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

$13999
Apply Now
Pay $114.99 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
caret

Product Details

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.
  • Additional Features:


  • Click here for more information on Electronic Recycling Programs
  • Return Policy

Additional Resources

From the Manufacturer

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.
caret

Specifications

caret

Questions & Answers

189Questions
caret
Q:I don't have a sump basin, just a crawlspace foundation floor that slopes. is it sufficient if i just place the pump in a low-point?
by|Jan 9, 2023
3 Answers
Answer This Question

A:  These units can be used in crawl space as long as they are pumping clear water only. The unit will come on when the water level reaches 9" from the bottom of the pump and shut off when the water level drops to 4" from the bottom of the pump.

by|Jan 11, 2023

    A:  If the enclosed space holds water 6”deep or more it should work. Level the pump to operate properly.

    by|Jan 12, 2023

      A:  I don’t believe that will work. There is a 3/4-1” rise from the floor to the top of the base so you’d end up having at least an inch of water before the pump would begin to pump. My suggestion is to use a pool pump that will pick up water as it begins to accumulate. The negative side of this is that you have to manually plug this type of pump each time you want it to work.  Hope this helps 

      by|Jan 11, 2023
        caret
        Q:Which pump is Home Depot selling? 3 or 4 screws on the top cap?
        by|Dec 24, 2022
        1 Answer
        Answer This Question

        A:  The new Ridgid submersible sump pumps will have the 4 screw cap.

        by|Jan 17, 2023
          1 found this answer helpful
          caret
          Q:Is this the new model with now 4 small phillips head screws holding the top on as opposed to the previous design that had only 3. I'm not referring to the three very long bolts holding the asm together. Did they also change the float ball to white?
          by|Dec 20, 2022
          1 Answer
          Answer This Question

          A:  The newest models with have the 4 small Phillips Head Screws holding on the switch cap. The older style only had 3 Phillips Head Screws holding on the switch cap. The floats and rods are the same size but the colors have changed.

          by|Dec 28, 2022
            27 found this answer helpful
            caret
            Q:will reducing the outlet to 3/4 copper hurt the pump? im wanting to use it for if my water sofener leaks i want to use the existing copper line to drain the collection pan.
            by|Dec 5, 2022
            2 Answers
            Answer This Question

            A:  The sump pumps are designed with a 1 1/2" discharge. They can be reduced to 1 1/4" but no smaller. By reducing the pipe down smaller, you cause a back pressure on the pump and will damage the motor. Also, our sump pumps are designed for clear water only. Discharge from a Water Softener is considered brine water and will damage the pump and void the warranty.

            by|Dec 28, 2022
              33 found this answer helpful

              A:  It will not hurt the pump, it will reduce the flow rate which may not be a problem in this case.

              by|Dec 28, 2022
                32 found this answer helpful
                Showing 1-4 of 189
                caret

                Customer Reviews

                4.7 out of 5
                (1,216)
                • 4.7
                  out of 1,216 reviews
                • 94%recommend this product
                Filter by:
                Showing 1-10 of 1,216 reviews
                Relief
                Selected this pump after researching top 10 sump pumps when both primary and secondary pumps were found inoperable. The fast delivery option worked when needed ASAP. So far it's been working fine. Did notice that its rusting already but that may be normal. Otherwise seems to be cycling and pumping out the water!
                by
                • Verified Purchase
                • Recommended
                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.
                by
                • Verified Purchase
                • Recommended
                7 found this review helpful
                This product failed within 3 days--its switch stopped working properly. Repeatedly, this pump wo...
                This product failed within 3 days--its switch stopped working properly. Repeatedly, this pump would stop operating even though the float was fully underwater. I would jostle the float a little, and the pump would start up, but then never cycle. An expert looked at the installation, made a small change, and said, "If it stops again, it has definitely failed." The pump stopped again that same day, and as my crawl space began to flood, I called the expert to replace this model with a different one.
                by
                  6 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!
                  by
                    7 found this review helpful
                    I have had 3 major floods in a finished basement so i read the reviews to try and make sure i got...
                    I have had 3 major floods in a finished basement so i read the reviews to try and make sure i got the best pump i could buy. This item had great reviews and an industry leading 5 year warranty. Had in installed and it immediately stopped working. I found out that it is supposed to have a really thin rubber tether that connects to bottom of float and attaches to the pump. Mine was missing or fell off. In addition i thought this was an extremely poor design as the rubber will get dry rotted being in constant water and probably need replacing within a year. I called wayne and told them this and they informed me that this part was not covered under their 5 year warranty and should be replaced every year. Who ever heard of having to replace parts on a new sump pump every year!. In addition the pump had only been in my crock for 1 day and was already more rusted than the liberty pump i had in there for 10 years. I will never purchase a wayne again. Stick with liberty as they make much better quality pumps.
                    by
                      12 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.
                      by
                      • Verified Purchase
                      • Recommended
                      3 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
                      by
                      • 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.
                      by
                      • Verified Purchase
                      • Recommended
                      7 found this review helpful
                      This 3/4 HP Sump Pump meets all my expectations: - Power is enough to clear water from 5 feet bel...
                      This 3/4 HP Sump Pump meets all my expectations: - Power is enough to clear water from 5 feet below. - Installation is easy, about 1/2 hour if you have the Quick Connect Tube from the Home Depot. - Just bought this pump on 04/20/2015 - It should be perfect if the Wayne Maker mentioned the quick connect tube or how to make it...
                      by
                      • Verified Purchase
                      • Recommended
                      4 found this review helpful
                      I am very impressed.  For ease of installation, solid craftsmanship, and performance I give this ...
                      I am very impressed.  For ease of installation, solid craftsmanship, and performance I give this 5 stars. While doing my spring maintenance, I discovered that the sump pump that was installed in my house came from the early 1990's.  It had deteriorated pretty badly and I felt like replacing it as a preventative measure would be a good idea.  The model was a 1/3 hp with an outdated switch and float set-up. After looking over the various models available, I elected to pursue this.  Not only was it well reviewed, but it seemed solidly made, affordably priced, and more powerful than the unit I had previously.  I ordered it online and took advantage of the free shipping.  It showed up two days later, much to my surprise, and I immediately went to work.  This unit is magnitudes better than the one I had.  It was a joy to install, I simply cut new PVC and threaded an adapter onto it with some sealant.  The model I used was (http://www.homedepot.com/p/1-1-2-in-PVC-DWV-Hub-x-MIPT-Male-Adapter-C4804HD112/100347535). Once completed, I cleaned out my existing sump basin and placed this unit on the bottom.  After plugging it in, I decided to gather my wife for a test of this units capabilities.  We got several five gallon buckets and proceeded to fill the sump basin.  This unit kicked on and immediately went to work--it was quiet, efficient, and powerful. 
                      by
                      • Recommended
                      15 found this review helpful
                      Showing 1-10 of 1,216 reviews

                      Frequently Bought Together

                      +
                      +
                      Price:
                      $13999

                      Compare Similar Submersible Sump Pumps

                      current product
                      1/3 HP Cast Iron Submersible Sump Pump with Vertical Float Switch
                      Exclusive1/2 HP Aluminum Sump Pump Vertical Switch1/2 HP Stainless Steel Dual Suction Sump Pump1/2 hp. Stainless Steel/Cast Iron Submersible Sump Pump
                      BrandWayneEverbiltRIDGIDDEWALT
                      Name1/3 HP Cast Iron Submersible Sump Pump with Vertical Float Switch1/2 HP Aluminum Sump Pump Vertical Switch1/2 HP Stainless Steel Dual Suction Sump Pump1/2 hp. Stainless Steel/Cast Iron Submersible Sump Pump
                      Price
                      $13999
                      $17700
                      $27900
                      $27900
                      Ratings
                      (1214)
                      (21)
                      (951)
                      (3)
                      Discharge Flow @ 0 ft. (gallons/hour)4600408052006100
                      Housing MaterialCast-IronAluminumStainless steelStainless steel
                      Impeller Materialreinforced poly carbonatePlasticThermoplasticCast Iron
                      Voltage120v115v120v120v
                      THD SO SKU 1004136666
                      View ProductView ProductView ProductView Product