By Caleb MorganUpdated November 2026
If you need to replace a Delta faucet aerator, the most important thing is matching the thread size, the flow rate and the insert style to the faucet already on your sink. A wrong size will either not thread on at all or leak at the base, and a flow rate that is too low can make a kitchen faucet feel weak. This list is built around those practical checks: thread compatibility, the GPM (gallons per minute) rating, how many parts come in each pack, and the general reputation of the brand and product type. Each product below is a replacement aerator or aerator set, not a full faucet.
Our top picks at a glance
- 1
TOP CHOICEBest overallDelta Faucet RP330 Aerator for 2.2 GPM, ChromeView on Amazon - 2
TOP CHOICEBest for a direct Delta matchDelta Faucet RP53998 2.2 Gpm AeratorView on Amazon - 3
TOP CHOICEBest for keeping spares on hand28 pcs Faucet Aerators with 5 Pcs Faucet Aerator Key Aerators ReplacemView on Amazon - 4
Best for high flow4Pcs Bathroom Faucet Aerator Replacement – 15"/16" 24mm Kitchen BathroView on Amazon - 5
Best for water saving5 Pieces Faucet Aerator – Insert Water Tap Aerators Faucet Flow RestriView on Amazon - 6
Best budget pickSHAP+ Faucet Aerator, Flow Restrictor Insert, Sink Aerator ReplacementView on Amazon
Our Top Picks
The table below gives a quick view of each option. The detailed notes follow it.
| Product | Best for | Key feature |
|---|---|---|
| Delta Faucet RP330 Aerator for 2.2 GPM, Chrome | Matching a standard Delta kitchen or bath faucet | 2.2 GPM chrome aerator |
| Delta Faucet RP53998 2.2 Gpm Aerator | Direct Delta-branded replacement | 2.2 GPM Delta-branded part |
| 28 pcs Faucet Aerators with 5 Pcs Key Aerators Replacement Inserts | Keeping spares for several sinks | Large assortment of sizes |
| 4Pcs Bathroom Faucet Aerator Replacement, M24 Male Thread | Stronger flow from a weak faucet | High flow design |
| 5 Pieces Faucet Aerator Insert, 1.2GPM | Reducing water use | 1.2 GPM flow restriction |
| SHAP+ Faucet Aerator Insert, 12 pcs | Budget replacements and spares | Includes washers, fits internal and external threads |
Delta Faucet RP330 Aerator for 2.2 GPM, Chrome
Delta Faucet RP330 Aerator for 2.2 GPM, Chrome
Best for: Matching a standard Delta kitchen or bath faucet
This is a chrome replacement aerator rated at 2.2 GPM, a common flow rate for residential kitchen faucets. It suits homeowners who want a part that matches the original Delta design and finish rather than a generic insert.
Key specs
- Flow rate: 2.2 GPM
- Finish: chrome
- Brand: Delta Faucet
Pros
- Brand-matched part for Delta faucets
- 2.2 GPM is a familiar standard flow rate
- Chrome finish blends with most Delta fixtures
Cons
- Single-part pack offers no spares
- Fit should be confirmed against the existing thread size
Bottom line: A safe first choice for anyone who wants an original-style Delta replacement and has confirmed the thread size on the faucet.
Delta Faucet RP53998 2.2 Gpm Aerator
Delta Faucet RP53998 2.2 Gpm Aerator
Best for: Direct Delta-branded replacement
This is another 2.2 GPM aerator sold under the Delta Faucet name. It is a good fit for owners who prefer a brand-labeled part and want the flow rate to match the original.
Key specs
- Flow rate: 2.2 GPM
- Brand: Delta Faucet
Pros
- Brand-labeled replacement part
- Standard 2.2 GPM rate
- Simple single-part purchase
Cons
- Limited detail in the listing about thread type
- No extra inserts or washers included
Bottom line: Pick this if you want a Delta-labeled aerator and can verify the thread before ordering.
28 pcs Faucet Aerators with 5 Pcs Faucet Aerator Key Aerators Replacement Inserts for Sink M16.5 18.5 21.5 24 mm for Bathroom or Kitchen
28 pcs Faucet Aerators with 5 Pcs Faucet Aerator Key Aerators Replacement Inserts for Sink M16.5 18.5 21.5 24 mm for Bathroom or Kitchen
Best for: Keeping spares for several sinks
This assortment covers several common diameters, including 16.5, 18.5, 21.5 and 24 mm, and includes a key tool. It suits households with multiple sinks or anyone who wants to keep a spare on hand.
Key specs
- Sizes listed: 16.5, 18.5, 21.5 and 24 mm
- Includes aerator key tool
- 28 pieces in the set
Pros
- Wide size range for trial fitting
- Key tool included for removal
- Good value for spares
Cons
- Many pieces will not match a given Delta faucet
- Requires measuring to find the correct size
Bottom line: Best for people who want several sizes on hand and are comfortable measuring the existing aerator.
4Pcs Bathroom Faucet Aerator Replacement – 15″/16″ 24mm Kitchen Bathroom Sink Attachment High Flow Aerator for Sink Faucet Aerators M24 Male Thread
4Pcs Bathroom Faucet Aerator Replacement – 15"/16" 24mm Kitchen Bathroom Sink Attachment High Flow Aerator for Sink Faucet Aerators M24 Male Thread
Best for: Stronger flow from a weak faucet
This high-flow aerator set uses an M24 male thread and is marketed for stronger water delivery. It may help if a faucet feels underpowered, though the result depends on the rest of the plumbing.
Key specs
- Thread: M24 male
- Pack of 4
- Designed as a high-flow aerator
Pros
- Set of four gives spares
- M24 male thread is a common size
- Targets weak flow complaints
Cons
- High flow can mean more splashing
- Not every Delta faucet uses this thread
Bottom line: A reasonable choice if a faucet has low pressure and the thread matches M24.
5 Pieces Faucet Aerator – Insert Water Tap Aerators Faucet Flow Restrictor Replacement Parts for Bathroom or Kitchen, 1.2GPM，16.5mm/0.64Inch
5 Pieces Faucet Aerator – Insert Water Tap Aerators Faucet Flow Restrictor Replacement Parts for Bathroom or Kitchen, 1.2GPM，16.5mm/0.64Inch
Best for: Reducing water use
This aerator is rated at 1.2 GPM and includes a 16.5 mm size. It suits anyone aiming to cut water use, though low-flow aerators can feel slower when filling pots.
Key specs
- Flow rate: 1.2 GPM
- Size: 16.5 mm (0.64 inch)
- Pack of 5
Pros
- Lower flow rate saves water
- Five pieces for spares
- Clear size listed
Cons
- Slower fill times for large pots
- Restrictive flow can feel weak to some users
Bottom line: Choose this for water savings if your faucet is 16.5 mm and you do not mind a gentler stream.
SHAP+ Faucet Aerator, Flow Restrictor Insert, Sink Aerator Replacement Parts for Bathroom or Kitchen Sink Faucet Filter, Fit for Internal and External Thread Faucet Aerators, with Washer (12pcs)
SHAP+ Faucet Aerator, Flow Restrictor Insert, Sink Aerator Replacement Parts for Bathroom or Kitchen Sink Faucet Filter, Fit for Internal and External Thread Faucet Aerators, with Washer (12pcs)
Best for: Budget replacements and spares
This 12-piece set includes washers and is described as fitting both internal and external thread aerators. It is a practical pick for owners who want several spares without paying for a brand-name part.
Key specs
- Pack of 12
- Includes washers
- Fits internal and external threads
Pros
- Washers included
- Works with both thread styles
- Good number of spares
Cons
- Not a Delta-branded part
- Quality may vary between pieces
Bottom line: A sensible budget pick for spares, provided you confirm the thread and insert size first.
Buying Guide
Thread size and type
Most aerators screw onto either an internal (female) or external (male) thread at the faucet spout. Common metric sizes for aerator bodies include 24 mm male and 16.5 mm to 24 mm inserts. Unscrew the existing aerator, check whether the thread is on the inside or outside of the spout end, and measure the diameter with calipers if possible. A mismatch in thread is the most common reason a replacement will not fit.
Good picks for this: Delta Faucet RP330 Aerator; SHAP+ Faucet Aerator Insert
Flow rate (GPM)
Flow rate is measured in gallons per minute. Many residential kitchen faucets are rated around 2.2 GPM, while low-flow options at 1.2 GPM reduce water use but can feel slower. Check the flow rate printed on the old aerator or the faucet documentation before choosing, and avoid going far below the original unless you accept slower filling.
Good picks for this: Delta Faucet RP53998 2.2 Gpm Aerator; 5 Pieces Faucet Aerator Insert, 1.2GPM
Insert style and internal parts
An aerator is usually a small assembly of a housing, screen and flow-restrictor insert. Some sets include only the insert, while others include the full aerator body. Know which part you are replacing: if the screen is clogged, you may only need a new screen or insert, but if the housing is cracked, you need the whole assembly.
Good picks for this: 28 pcs Faucet Aerators with Key Replacement Inserts; 4Pcs High Flow Aerator Replacement
Use case and water pressure
If your faucet has low pressure, a high-flow aerator may help, but pressure is also affected by the supply line, shutoff valves and cartridge condition. A weak stream from every fixture in the house points to supply issues rather than the aerator. Test water pressure at a hose bib if you suspect a whole-house problem.
Good picks for this: 4Pcs Bathroom Faucet Aerator Replacement; Delta Faucet RP330 Aerator
Durability and materials
Chrome-finished brass or metal bodies generally hold up better than thin plastic housings, especially in hard-water areas. Mineral buildup and clogged screens are the usual cause of aerator failure. Choose a part that matches the finish of your faucet to avoid visible mismatch.
Good picks for this: Delta Faucet RP330 Aerator; SHAP+ Faucet Aerator Insert
Care and maintenance
Remove the aerator every few months and soak it in white vinegar to dissolve mineral deposits. Rinse it, brush the screen gently and reinstall it. Replacing the aerator when flow drops is simpler than trying to restore a heavily clogged one. Keeping a spare of the correct size makes this easy.
Good picks for this: 28 pcs Faucet Aerators Replacement Set; SHAP+ Faucet Aerator Insert
Compatibility with your Delta model
Delta uses several aerator designs across kitchen and bath faucets. Before buying, look up the model number on the faucet or in the installation guide from the manufacturer, then compare the aerator size and thread. When in doubt, bring the old aerator to the store or measure it at home.
Good picks for this: Delta Faucet RP53998 2.2 Gpm Aerator; Delta Faucet RP330 Aerator
FAQ
How do I know which aerator size my Delta faucet needs?
Unscrew the aerator and measure its outer diameter and thread type. Common sizes include 16.5 mm, 18.5 mm, 21.5 mm and 24 mm, and thread can be internal or external. Matching the thread and diameter is more important than matching the brand.
Can I use a different brand of aerator on a Delta faucet?
Yes, as long as the thread size and aerator style match. Many universal aerators fit multiple brands, but flow rate and fit can vary, so check the specifications before buying.
What is the difference between a 1.2 GPM and a 2.2 GPM aerator?
A 1.2 GPM aerator delivers less water per minute, which saves water but can feel slower. A 2.2 GPM aerator is closer to the standard for many residential kitchen faucets. Choose based on how fast you want water to flow and how much water you want to save.
How often should I replace a faucet aerator?
There is no fixed schedule. Replace it when flow drops, the spray pattern becomes uneven, or the screen cannot be cleared of mineral buildup. In hard-water areas, cleaning every few months is often enough before replacement is needed.
Why does my faucet still have low water pressure after changing the aerator?
The aerator is only one possible cause. Check the shutoff valves under the sink, the supply hoses and the faucet cartridge. If the problem affects several fixtures, the issue may be the main supply or a plumbing restriction. A licensed plumber can diagnose persistent pressure problems.
Do I need a key tool to remove a Delta aerator?
Many aerators can be removed by hand, but some are tight or recessed and need a key or aerator wrench. A key tool helps avoid scratching the finish. Wrap the aerator with a cloth if you use pliers.
Conclusion
For most Delta owners, the best replace delta faucet aerator is the one that matches the original thread, size and flow rate. The Delta Faucet RP330 and RP53998 aerators are the most direct brand matches, while the multi-piece sets are better for spares and multi-sink homes. If you need more flow, the M24 high-flow set is worth considering, and if you want to save water, the 1.2 GPM insert is the choice. Measure before you buy, and keep a spare of the correct size on hand.
Sources
- WaterSense guidance on faucet flow rates and water-saving fixtures (epa.gov)
- Information on residential faucet efficiency and flow rate standards (energy.gov)
- Plumbing product standards and certification information for fixtures
Related reading
- Replace Delta Faucet Stem: 7 Best Repair Kits Compared for 2026
- How to Replace a Delta Kitchen Faucet Cartridge in 6 Steps (2026)
- Delta Lav Faucet Parts: How to Identify and Replace Them Right
About Caleb Morgan
Caleb Morgan is part of our editorial team and reviews and edits our kitchen faucets & sinks guides, checking product details against manufacturer specifications and owner feedback.
