CHAPIN 20000 1 Gallon Lawn Garden Sprayer
WARNING!
Hazard: Improper use or failure to follow instructions can result in explosive failure causing serious eye or other injury. For safe use of this product, you must read and follow all instructions. Do not leave a pressurized sprayer in the hot sun. Heat can cause pressure build-up. Do not store or leave the solution in the tank after use. Always wear goggles, gloves, a long-sleeve shirt, long pants, and full foot protection when spraying.
Never use any tool to remove the pump if there is pressure in the sprayer. Never stand with your face or body over the top of the tank when pumping or loosening the pump to prevent ejecting pump assembly and/or solution from striking and injuring you. Never pressurize the sprayer by any means other than the original pump. Do not attempt to modify or repair this product except with the original manufacturer’s parts. Never spray flammable materials or heat, pressure, or gas-producing chemicals. Always read and follow the manufacturer’s instructions before use with this sprayer as some chemicals may be hazardous when used with this sprayer.
WARNING: Handling the brass parts of this product will expose you to lead, a chemical known to the State of California to cause birth defects and other reproductive harm.
Wash hands after handling.
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Parts
Note: Your particular sprayer may not include all the parts pictured above.
Repair Parts Kit Gaskets and Seals (not included)
WARNING!
To prevent the hose from blowing off, the hose must cover both barbs on the outlet tube adapter and touch flange (Fig. 1B) before hose nut is securely tightened (Fig. 1C).
Hose to Tank
Discharge/ Tool Holder Assembly
- Ensure the tool holder is assembled to the tank adapter before mounting the discharge assembly (Fig.1A). The Tool Holder snaps into the groove of the tank adapter. Figure 1D shows how the shield and cup are mounted (Not all models are provided with a tool holder, spray shield, and measuring cup).
- Insert the outlet tube portion of the discharge assembly into the tank adapter (Fig. 1A).
- Firmly insert the outlet tube portion into the tank adapter (Fig. 1B) leaving no gap between the tank adapter and outlet tube adapter. Firmly tighten the retaining nut to the tank adapter (Fig. 1C).
Nozzle / Extension Wand
Attach the nozzle to shut-off handle or extension wand per Fig. 2A-2D depending on the style of extension wand included with sprayer.
Deck Sprayers Only ( Fig. 2D-2G)
- Insert the nozzle into the cap (2E).
- Attach the cap to shut off the handle or extension wand (Fig. 2F-2G).
- Red, Fine spray for finer washes.
- Blue, Medium spray for sealers.
- Yellow, Course spray for semi-transparent stains.
Filter
The filter helps prevent clogging while spraying. It is located on the end of the outlet tube inside your sprayer tank. To clean the filter, remove the discharge assembly from the tank (Fig.1A). Make sure the filter is positioned at the bottom of the tank as pictured. Note: Filters are not supplied with deck sprayers.
Shield Attachment to Wand
Snap shield onto wand as shown. Using the spray shield will help protect your plants etc. from over spray. (Not all models are provided with a spray shield).
Pre-Use Check
- Do: Check the tightness of the hose nut to be sure the hose is securely attached to the tank outlet.
- Do: Inspect hose for deterioration, cracks, softness, or brittleness. If any of these conditions are found, replace hose before using. Replace with original manufacturer’s parts only.
- Do: Remove pump (see Filling, Pressurizing and Spraying Instructions), inspect interior and exterior of tank for signs of deterioration of body and bottom. Any sign of deterioration indicates possible tank weakening and could result in explosive bursting under pressure. If any of these signs are found, discard tank immediately and replace. Do not attempt to patch leaks, etc., as this could result in serious injury.
- Do: Follow Filling, Pressurizing, and Spraying Instructions, except use water only (Pump plunger 10-20 strokes and inspect for leaks).
- Do: Direct shut-off away from you and open to make sure discharge is not clogged.
- Do: If the unit passes this test, release pressure (see Pressure Releasing Instructions), empty the tank, and proceed with Filling, Pressurizing, and Spraying Instructions.
Filling
- Do: Turn the pump handle counterclockwise and remove the pump.
- Do: Prepare spray solution following all directions and safety warnings on the chemical label.
- Do: Fill tank to no more than the proper gallon marker. Do NOT: overfill to accommodate pump.
- Do: Check the pump to make sure that no grass or dirt is stuck to the barrel. Replace the pump in the tank and tighten it securely.
Pressurizing and Spraying
- Do: Turn the handle clockwise to tighten. Push the handle down, turn 1/4 turn counterclockwise to release.
- Do: Pump until you feel resistance.
- Do: Push the handle, down, turn 1/4 turn clockwise to lock. Begin spraying. Re-pump sprayer as required to maintain spray force.
- Do: Turn the end of the nozzle to adjust the spray pattern.
To Release Pressure
Sprayers with no pressure release valve
- Do: With the pump facing away, turn the locked handle counter-clockwise until air begins to escape. Stop turning the handle when you hear air escaping.
- Do: Point pump away until all air has escaped.
Sprayers with pressure release/relief valve
Lift and hold the cap OR, turn the valve slowly counterclockwise until the air is completely exhausted.
Pull up the stem until the air is completely exhausted.
- Do: Point the valve away from you when releasing pressure.
Care, Storage, and Maintenance
- Do: Rinse the tank thoroughly with water only, empty it, and refill it with water. Follow Filling, Pressurizing, and Spraying Instructions, except pump unit only 8-10 strokes.
- Do: Open shut-off and allow water to run through the discharge assembly.
- Do: Release pressure (Follow Pressure Release Instructions), remove the pump, and empty the sprayer.
- Do: Store the sprayer tank upside down, with the pump removed, in a warm dry location.
- Do: Periodically oil pump by dropping 10-12 drops of light oil down pump rod through opening in cover.
Fatigue-Free Spraying
For constant spraying, push down on shut-off handle and move grey locking mechanism away from you. To release, squeeze handle and move the grey locking mechanism back towards you. ( Not all models are provided with this feature).
Troubleshooting
The tank pressurizes but does not spray.
WARNING: Release pressure in the tank before troubleshooting.
Clean shut-off (Fig. 11A- 11D)
- Pull the handle straight up.
- Insert notches from the underside of the handle into plunger grooves and turn counter-clockwise.
- Remove the plunger and diaphragm. Clean plunger, diaphragm, and body. Flip the diaphragm and replace it.
- Tighten the plunger clockwise until flush with the top of the shut-off body. Do not over-tighten or the unit may not spray. Slide forks under the plunger, and push the handle down until it snaps into place.
Clean Nozzle Assembly
Remove the nozzle cap. Clean and re-assemble.
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CHAPIN 20000 Garden Sprayer 1 Gallon Lawn-FAQs
Can I use a garden sprayer to apply wood stain?
Yes, but it depends on the type of stain. Some stains, like Olympic Smartguard, are made for spray application. Always check the label to ensure it’s sprayer-compatible.
How far can this sprayer reach?
A standard pump sprayer like this typically sprays up to 10–15 feet, depending on the nozzle and pressure. Backpack sprayers may reach farther, but 30 feet is hard to achieve without powered equipment.
When is the best time to spray my lawn?
Apply lawn treatments when weeds are actively growing, usually from May to late September or early October.
What are the main parts of the CHAPIN sprayer?
Key components include the spray nozzle or wand, fluid tank, pump handle, pressure release valve, and hose.
What are the common spraying methods?
There are three basic spraying types:
1. Airspray (air atomizing)
2. Airless spray
3. Air-assisted (Airmix/Aircoat)
Each method affects coverage and droplet size differently.
What material is the sprayer tank made of?
The CHAPIN 20000 sprayer tank is made from durable polyethylene, which resists chemical reactions and is long-lasting.
How do I clean the sprayer after using stain?
1. For water-based stains: Use warm soapy water.
2. For oil-based stains: Use mineral spirits, a soft brush, and a rag.
Always flush the sprayer with clean water after cleaning.
How do I clean the spray nozzle?
Soak the nozzle in warm water mixed with dish soap for about 10–15 minutes. This helps dissolve residue and restore flow.
Can I use a garden sprayer to apply sealers?
Yes, for water-based and some penetrating sealers. Avoid using it with solvent-based sealers, as their harsh chemicals can damage internal parts of the sprayer.