ortho/roundup garden pump sprayer repair kit

Ortho/Roundup garden pump sprayer repair kit.

Note: This garden sprayer has only contained organic sprays (mostly for powdery mildew on our pumpkins) for the plants grown in our Children's Gardening Classes. If you are running some serious pesticides or herbicides through your sprayer you may want to wear some protective gloves during disassembly.

If your Ortho/Roundup garden sprayer takes a lot more pumps than usual to get pressurized or loses pressure quickly, you may want to purchase a repair kit instead of buying a whole new pump. For about $7 and about 10 minutes work you can make your sprayer like new again. These sprayers are actually made for Ortho and Roundup by a company called the Fountainhead Group.

The repair kit states it applies to o-style and ml-style Ortho/Roundup labeled sprayers. You can tell by the shape of your Ortho/Roundup sprayer if the kit applies to you. If in doubt you can look around the Fountainhead site at the following link to see what applies to your sprayer. They also produce other private label sprayers so they may have a sprayer repair kit that would fit your application.

The pump repair kit can be purchased at Home Depot or Lowe's as well as some hardware stores. I am sure other places carry them. It can also be purchased directly from the manufacturer (see link above).

Material List


  • 2 large flat head screwdrivers (may not be necessary)
  • small flat head screwdriver (may not be necessary)
  • pliers (may not be necessary)


  • Ortho/Roundup Pump Sprayer Repair Kit.......$6.78 ea.
  • light vegetable oil*

* the large o-ring (part #1) needs a light coating of vegetable oil. The manufacturer said to use vegetable oil as opposed to silicone or motor oil

ortho parts kit open

Parts included in repair kit. You will only need one of parts #1 and #4.


  • 1) Unscrew pump assembly (just as you would to fill pump): You can use your finger to lift the outside edge of part #2 and just pull it off. The new one can just be pressed in. This is just a one way type seal. When you push down on the pump air is pushed into the tank. When you pull back up suction closes it so the air can't leak back out. One a side note I had a slow leak in the pump once and found that a little bit of crud around this seal was keeping it partially open. Cleaning it solved the problem.
    Part #4 just slides off the stem and can be replaced with the new one of the same size.
ortho parts kit open

Location of sprayer repair parts #2 and #4.

  • 2) Disassemble pump: This is the trickiest part of the repair. While not difficult it is cumbersome. You must push in the tabs and turn clockwise. I found that using two large screwdrivers from below made it easier to get the tabs open. See pic below.
disassemble pump assembly

Disassembling sprayer pump. Push in tabs at arrows and turn clockwise.

disassemble  ortho pump assembly from below

Using screwdrivers to push in tabs.

Once disassembled you will see the large o-ring (part #1). You can use a small flat tip screwdriver to pry it out. Make sure you lubricate the new o-ring with vegetable oil and slide it on (if you don't it will be extremely hard to pump). I also lubed the inside of the cylinder with a light coat of vegetable oil

disassemble  ortho pump assembly from below

Location of part #4. Replace with the one of matching size.

  • 3) Replace small o-ring (part #3) in handle: Unscrew the wand from the squeeze handle and you can see where part #3 is located. You can use your fingernail or something small to pry it out. Just replace with the new one.
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Replacing small o-ring (part #3)

  • 4) Hose repair (if needed): After improperly storing the sprayer last winter the hose developed a kink. You can just unscrew the hose from the tank, pull off the hose, cut off the kink, and reattach.
garden pump sprayer hose repair

Permanent kink in hose.

garden pump sprayer hose repair

Unscrew hose, cut off kink, and replace.

  • 4) Completed Repair: Once completed, I noticed a huge difference in the performance of the pump. The number of pumps needed to pressurize the sprayer went down considerably and it no longer leaked air.