Depth Guide For a DIY Submersible Water Pump | 2021 Homeowner Project

A DIY project for a submersible pump is divided into a 3 parts process. This pump is made with a PVC body, making it shock proof.

The measurements included are in accordance with the PVC caps diameter. The measurements can be changed accordingly depending on the size of PVC cap you are using. The use of a caliper is a necessity in this project.

A recent blog post by WaterFiltersAdvisor explains how submersible water pumps function and how to apply to many DIY projects.

Features of a Submersible Water Pump: 

Submersible pumps are very useful and efficient due to the following features: 

  1. Centrifugal effect, which means the water gets thrown out creating more pressure at the outlet. 
  2. Prime Free. These do not require any kind of substance to initiate the working of this machine.
  3. Cavitation Free. Due to its submersible quality into the liquid in question, air pockets are not made in the running liquid.
  4. Pumping water from deep pits to high altitudes. This totally depends on the quality of the pump. It can be used to pump water from small to very high quantities. Therefore, the range is quite high. This can even be used to pump into a utility sink if needed.

Things you Need for this Project: 

  1. 775 Motor
  2. 60 MM PVC Cap (QTY 2)
  3. Impeller Blade
  4. Propeller Shaft (9.94 mm threaded end, 16.10 mm rare end, 4.88 mm inner motor shaft holder).
  5. PVC Elbow Connector
  6. Plastic Adhesive
  7. Electric Drill
  8. Digital Caliper (for diameter measurements)
  9. Drawing compass

Steps for the Project:

Part 1

Step 1: Mark the center (Point 0) on one of the PVC caps. Now mark a circle around it of 17.4 mm diameters (8.7 mm radius on the compass)

Step 2: Mark two points, 14.23 mm apart from either side of the center. 

Step 3: Drill a 17.4 mm hole in the center to fit the motor shaft in it. 

Step 4: Now drill 2 holes with a 4 mm drill bit on either side of the center. These are for screw fittings to attach the motor. 

Step 5: Attach the propeller shaft to the motor shaft and bolt it tight. 

Step 6: Apply water resistant grease solution to the first PVC cap and tighten it with the help of a motor & screws.

Part 2 (Impeller Blade DIY)

Step 1: Mark 3 circles on the second PVC cap with the help of a drawing compass. 

  • The first circle mark is to be 6 mm diameter (3 mm radius) ‘Circle X’.
  • The second circle is to be 20 mm diameter (10 mm radius) ‘Circle Y’.   
  • The third circle is to be marked at 54 mm diameter (27 mm radius) ‘Circle Z’.

Step 2: Mark the cap from ‘Point 0” to ‘Circle Z’ with 8 lines cutting the pie into 8 equal sectors. This would form a wheel like structure. 

(Let’s name the lines as, ‘Line 1’, ‘Line 2’, ‘Line 3’ till ‘Line 8).

Step 3: Now use a scale and join the 6 mm diameter circle’s outer edge to the 54 mm diameter circle with the help of lines parallel to the 4 initial lines. 

Step 4: Adjust the drawing compass on two points. Place one end on point “1Z” and the other end at “7Y” creating a curved line till point “8Z”.

Step 5: Move anti-clockwise by placing the compass point at “Z2” and the other end at “8Y”, drawing a curve till “1Z”.

Step 6: Keep moving forward by placing one end of the compass at “3Z” and another end at “1Y” curving it till “2Z”. Such that the last coordinates will be “8Z”, “6Y” and “7Z”.

Step 7: Measure the diameter of the propeller shaft’s threaded end. Drill a hole in the center of the marked PVC. The drilled hole should be 0.8 mm bigger than the threaded shaft diameter.

Step 8: Cut a 3 mm disk out of the second PVC. 

Step 9: To make 8 impeller blades, use the PVC cap ring from which the disk was detached. Cut the PVC ring into 20.59 mm long, 17.31 mm wide and 2.61 mm slim rectangles. 

Step 10: Join these 8 blades to the impeller disk on the 8 curves (marked in Step 4) with the help of plastic adhesive. Image below shows the finished DIY impeller blade.

Step 11: Place the impeller on the propeller shaft and secure it with the help of a nut, connecting it to the motor. 

Part 3 (Elbow Connector)

Step 1: The elbow connector measures 60 mm at 90 degrees. Drill a hole of 16.07 mm diameter on one of the 60 mm heads of the elbow connector.

Step 2: Get a PVC electrical wiring pipe of about 8 inches and 16.07 mm in diameter. Attach it to the connector’s hole with the help of PVC Glue AB. Allow the glue to dry well.

Step 3. Trim out the excess of the pipe sticking out from the inside of the elbow connector.

Step 4: Attach the Elbow Connector with the motor assembly with the help of another PVC ring securing the whole thing with a strong PVC water resistant adhesive.

Step 5: Weld a 12VDC/5A power cord to the motor.

Step 6: Enclose the motor in a PVC cylinder. Drill a hole in the PVC Lid to stick out the cord from one end. Glue the PVC lid to it and make sure to waterproof the cord outlet.  

Step 7: Submerge the open head of the elbow connector in the water and connect a PVC water tube to the electrical wire PVC opening. Plug the cord to a power source and switch it on. Your Submersible Water Pump is ready to use. 


This DIY project requires professional knowledge about PVCs, connectors and welding. This machine has a good pressure of water outlet. Therefore, it is good to be used for the following tasks:

  • Emptying Swimming Pools:

The submersible pumps range from heavy duty industrial usage to minor home use. A very common domestic use of a submersible pump is to empty a swimming pool. The stagnant water is pumped out to clean the inside of the pool. This practice is very efficient if the pool does not have a drainage system.

  • Pumping Water to Elevated Places: 

The pump is also used to push water to a higher places. For example you have a house water supply source in the ground while you need to fill the water tank located at the roof of your home. The pump can help push the water from the ground into the tank on the roof. 

  • Pressure Cleaning:

You can also use the pump for high pressure cleaning. The tap water sometimes does not have the right pressure. This submersible pump can help achieve high pressure water. 

  • Stagnant Water Removal:

Sometimes due to heavy rains or a damaged sewage system, a specific lower area of a house gets flooded with water. The stagnant water can be pushed out with the help of a submersible pump.

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