1. Introduction
This manual provides instructions for the installation, operation, and maintenance of your Neoperl Faucet Cascade Aerator, model 31 2200. This aerator is designed to provide a super low flow of 0.5 gallons per minute (GPM) with an aerated stream, contributing to water and energy savings. It features a dual-threaded design for compatibility with various faucets in both kitchen and bathroom settings.
2. Safety Information
- Always turn off the water supply to the faucet before attempting installation or maintenance.
- Use appropriate tools and avoid over-tightening to prevent damage to the aerator or faucet.
- Keep small parts away from children to prevent choking hazards.
- If you are unsure about any step, consult a qualified plumber.
3. Package Contents
Verify that all components are present before beginning installation:
- Aerator Housing (Chrome-plated brass)
- Aerator Insert (Lime green/natural dome, screenless cascade construction)
- Washer

Image: Neoperl Faucet Cascade Aerator, main component. This image displays the primary aerator unit, which includes the housing and the lime green insert.
4. Installation
Follow these steps to install your Neoperl Faucet Cascade Aerator:
- Prepare the Faucet: Turn off the water supply to the faucet. Remove the existing aerator by unscrewing it counter-clockwise. Clean any debris or mineral buildup from the faucet spout threads.
- Identify Thread Type: The Neoperl aerator is dual-threaded (Regular male 15/16"-27 and female 55/64"-27). Determine if your faucet has male (threads on the outside of the spout) or female (threads on the inside of the spout) threads.
- Insert Washer: Place the provided washer into the aerator housing. Ensure it sits flat.
- Attach Aerator:
- For Faucets with Male Threads: Screw the aerator onto the outside of the faucet spout clockwise until snug.
- For Faucets with Female Threads: Screw the aerator into the inside of the faucet spout clockwise until snug.

Image: Installation of a faucet aerator. This image illustrates how to attach the aerator to both male and female threaded faucet spouts.
- Hand-Tighten: Hand-tighten the aerator. Avoid using pliers or wrenches, as this can damage the aerator or faucet finish.
- Test for Leaks: Turn on the water supply slowly and check for any leaks around the aerator connection. If leaks occur, gently tighten the aerator further.

Image: Aerator size comparison. This image shows the "Regular" size aerator (highlighted in red) alongside "Junior" and "Tom Thumb" sizes, with coins (quarter, nickel, dime) for scale, indicating the relative size of the aerator.

Image: Aerator and faucet spout dimension diagram. This diagram provides measurements for the aerator (A, B, C) and the internal diameter of a faucet spout (D), useful for ensuring compatibility.
5. Operation
The Neoperl Cascade Aerator provides a consistent 0.5 GPM flow rate, regardless of water pressure fluctuations. This super low flow rate helps conserve water and energy by saving up to 30% water compared to a 2.2 GPM aerator, without compromising the quality of the aerated stream. The aerator produces a classic spray flow stream, which is soft and splash-free.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your aerator:
- Cleaning: Periodically unscrew the aerator from the faucet. Rinse the aerator insert under running water to remove any loose debris.
- Mineral Buildup: If water flow becomes restricted or uneven, mineral deposits (lime scale) may be present. Soak the aerator insert in a solution of equal parts white vinegar and water for 30 minutes to an hour. Use a soft brush to gently scrub away any remaining deposits. Rinse thoroughly before reassembling.
- Inspection: Inspect the washer for any signs of wear or damage. Replace if necessary to prevent leaks.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Reduced or uneven water flow | Mineral buildup or debris in the aerator. | Remove and clean the aerator insert as described in the Maintenance section. |
| Water leaking around the aerator connection | Aerator not tightened sufficiently or damaged/worn washer. | Gently tighten the aerator by hand. If leaking persists, replace the washer. |
| Aerator does not fit the faucet | Incorrect thread size or type for your faucet. | Verify your faucet's thread type (male/female) and size against the aerator's specifications. This aerator is dual-threaded (Regular male 15/16"-27 and female 55/64"-27). |
8. Specifications
- Model: 31 2200
- Flow Rate: 0.5 Gallons Per Minute (GPM)
- Thread Size: Regular male 15/16"-27, female 55/64"-27
- Material: Brass housing, plastic insert
- Finish Type: Chrome
- Stream Type: Aerated, Cascade
- Compliance: Meets ANSI 61, ASME A112.18.1, Low Lead Requirements
- Item Weight: 1.12 ounces
9. Warranty and Support
For warranty information or technical support, please contact Neoperl customer service or refer to the official Neoperl website. Keep your purchase receipt for warranty claims.