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The Little Giant w12g05s7-21p - 1/2 hp 12 gpm hp deep well submersible pump (2-wire 115v) is available for purchase today.

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Little Giant W12G05S7-21P - 1/2 HP 12 GPM HP Deep Well Submersible Pump (2-Wire 115V)

(Based on expert analysis, manufacturer ratings and customer reviews)

4.8 out of 54.8 out of 54.8 out of 54.8 out of 54.8 out of 5
5 Reviews
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Ships Tuesday, Oct 25th

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Outlet Size
Deep Well
4" Submersible Deep Well Pump (2-Wire 115V)
Ideal for use with 4" I.D. or larger wells
Powered By Industry Standard Franklin Electric Motor
Proven superior quality & performance ensuring quiet operation

Hex Rubber Bearing w/ Extra-Large Surface
Provides shaft stability and multiple flow channels
Keeps small particles such as sand away from bearing surfaces

Built-In FlomaticÖ Check Valve
Prevents backflow and ensures system pressure

Removable Suction Screen
Helps to prevent debris from clogging impellers

Celcon« Disk
Provides close tolerances for increased performance

Ceramic Bearing Sleeve & Stainless steel Up-Thrust Washer
Prevents excessive wear and provides added durability

1-1/4" NPT Thermoplastic Discharge Head
Provides full-flow performance without the risk of corrosion

2-Year Warranty

*Note* Installation Checklist Can Be Found On Spec Tab

Need Help? Ask Our Water Pump Experts.
0.5 hp
Gallons Per Minute
12 Gallons
Outlet Diameter
Housing Material
Stainless Steel
Impeller Material
Total Head Lift
231 Feet
24 Pounds
Product Length
22.29 Inches
Product Width
3.9 Inches
Consumer Warranty
2 Years

*Ask Jim about the Little Giant 558564. Sorry, no repair questions:




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  4 Questions
Q: In have 4 inch ID pvc well casing ..your product description says it will fit. What is the width of the pump?
by Vince from Indiana on June 16, 2016

A: The width of these pumps average 3.90" and WILL fit inside a 4" well casing.
If you have any other questions, please let me know.
by Jim, Product Expert
Q: I plan to replace a 30 yer old pump that is at 200 ft. and lower the new pump to 250 ft in a 400 ft deep well. Will I need to a check valve mid way up as well as at the well head?
by Ken G from California on July 27, 2015

A: Most submersible deep well pumps include a built-in check valve at the discharge port of the pump and It is recommended that additional spring loaded in-line check valves be installed in the drop pipe @ 200ft intervals only.
by Jim, Product Expert
Q: what parts are involved with submersible pumps that can fail and breakdown or if it doesn't work you just have to replace the entire pump?
by Sal from New York on January 22, 2014

A: When it comes to 2-wire deep well submersible pumps, the pump starting controls are located inside the pump. Any of these components can fail and cause the pump to become inoperable. By installing a 3-wire pump, those components would be located inside a CONTROL BOX, making repairs much easier when failure of these components are the cause of your pump not operating. Of course if the pump has failed due to burnt motor windings or some other cause, would would still need to pull and replace the pump, but you would have a better understanding of the pump status when the pump starting components are above ground as opposed to 50-500 feet or more, below ground.
by Jim, Product Expert
Q: Hi Jim,
I have a well with 4 inch bore (pipe with 4" ID) and want to switch to a 4" submirsible pump. my question is with a 4" submirsible pump how much clearance do i need.

does the bore not need to be much larger then 4" otherwise how will the pump suck water if the will pipe walls are touching the pump.

by Javid A from California on January 06, 2014

A: Thank you for your interest in Water Pumps Direct. The actual pumps measure 3.90" in diameter and will fit inside a 4" ID well casing.
by Jim, Product Expert
Little Giant 558564 Reviews & Ratings
5 Reviews  Sort by 
Jim, the Water Pump Expert
Water Pump Expert

Product Expert
Total Reviews
45 Reviews
Total Helpful Votes
1243 Helpful Votes
Water Pumps Direct Recommended

Like the other recommended deep well pumps here, this pump is also made by Franklin Electric, a known and trusted brand with a long history of providing dependable pumps.

With the Little Giant name, you can expect a higher quality and longer lasting pump that also includes that Franklin Electric motor that you've come to know and love! And the ceramic bearing sleeve & stainless steel up-thrust washer will help to prevent excessive wear and provides added durability.

Because of all... more
Jim Recommends This Model
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Wayne M.
Edmond, OK
Purchased from Water Pumps Direct
Purchased 8/28/15
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
It's A Great Pump
I took out a one horse and replaced it with a little giant half horse and it is just as strong as the one horse!
Wayne Recommends This Little Giant Product
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Brenda & Mike S.
Trail, OR
Purchased from Water Pumps Direct
Purchased 6/29/16
5 out of 55 out of 55 out of 55 out of 55 out of 5
1/2 Hp 12 Gpm Hp Deep Well Submersible Pump (2-wire 115v) Little
This pump was installed and powered by an off grid system. The pump works great and it pressure's up on a 30/50 switch very nicely. We are very happy with the Little Giant,and we would give this pump a thumbs up for anyone that lives off grid.
Brenda Recommends This Little Giant Product
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Ernest O.
Lyndonville, NY
Purchased from Water Pumps Direct
Purchased 3/20/16
4 out of 54 out of 54 out of 54 out of 54 out of 5
Little Giant Well Pump
This unit is twice as fast at building pressure as compared to the Goulds pump it replaced and quieter as well. It also came with heat shrink sleeves with sealant and wire butt connectors which I soldered. So far, so good!

I also understand that this pump comes with a Franklin motor.
Ernest Recommends This Little Giant Product
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John D.
Spotsylvania, VA
Purchased from Water Pumps Direct
Purchased 9/2/14
5 out of 55 out of 55 out of 55 out of 55 out of 5
Excellent Pump
I installed this pump with a 10 GPM Dole valve in a very shallow well six days ago. It works much better than the jet pump it replaced.
John Recommends This Little Giant Product
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