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Finding the right delta lav faucet parts can save a bathroom repair from turning into a full fixture replacement. Most Delta lavatory faucets use a small set of replaceable components: a cartridge or valve, a pop-up assembly, an aerator, handle parts, and supply connectors. The challenge is that Delta uses many internal designs across its lines, so a part that looks identical can be the wrong size or type. This list focuses on parts that owners and plumbers most often reach for, and the selection criteria are fit to the faucet series, material quality, ease of identifying the match, and how well each component is documented for replacement. We did not run any of these parts through physical testing. The picks reflect specifications, brand reputation and common owner feedback patterns.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Delta RP19806 Cartridge | Single-handle lavatory repairs with a dripping spout | Replacement cartridge matched to common Delta single-handle designs |
| Delta RP46327 Cartridge | Owners of Delta single-handle bathroom faucets with a stiff or leaking handle | Ceramic disc style cartridge for smooth operation |
| Delta RP70000 Pop-Up Assembly | Slow-draining or stuck pop-up stoppers | Complete pop-up drain assembly with the lift rod connection |
| Delta RP36382 Aerator | Restoring flow after mineral buildup | Replacement aerator sized for standard Delta lavatory spouts |
| Delta RP23836 Handle Kit | Replacing a cracked or worn lever handle | Handle set with matching set screw and cap |
| Delta RP39966 Stem Cartridge Kit | Older two-handle lavatory faucets | Stem-type component for two-handle compression designs |
| Delta RP50440 Supply Line Set | Replacing corroded or leaking flexible supply hoses | Braided stainless supply lines with compression fittings |
| Delta RP52570 Seal and O-Ring Kit | Stopping small leaks at the base or spout | Assorted O-rings and seals for common Delta valve bodies |
| Delta RP48894 Escutcheon Set | Covering worn deck holes or matching finishes | Decorative escutcheon plate in a matching finish |
| Delta RP55320 Drain Stopper | Replacing a broken or missing stopper | Push-button style stopper for standard lavatory drains |
Delta RP19806 Cartridge
This is a good starting point for owners of a single-handle Delta lavatory faucet whose spout drips after the handle is closed. Cartridge failure is one of the most common causes of drips in these fixtures, and a matched replacement is usually more reliable than a generic part.
Key specs
- Single-handle replacement cartridge for compatible Delta lavatory faucets
- Cartridge body with internal seals and stem assembly
- Designed to match specific Delta valve housings, so model compatibility matters
Pros
- Directly addresses the most frequent cause of single-handle drips
- Replacing the cartridge avoids removing the whole faucet
- Widely documented fit information from Delta
Cons
- Compatibility depends on the exact faucet series, so verification is required
- Installation can be fiddly without a cartridge puller tool
Delta RP46327 Cartridge
This suits owners of Delta single-handle bathroom faucets whose handle feels gritty, sticks in the middle of its travel, or lets water through after shutoff. Ceramic disc designs are often praised for smoother action than older rubber-washer styles.
Key specs
- Single-handle cartridge with ceramic disc valving
- Intended for compatible Delta lavatory series
- Includes O-rings and seals for the cartridge body
Pros
- Ceramic disc action generally gives smoother handle movement
- Useful when the handle has become stiff rather than dripping
- Clear part number matching in Delta documentation
Cons
- Requires confirming the exact cartridge type before ordering
- Not interchangeable with older compression-style valves
Delta RP70000 Pop-Up Assembly
This is aimed at owners whose pop-up stopper no longer seals, won’t lift, or has become stuck. Many slow drains in bathroom sinks trace back to the pop-up linkage rather than the trap itself.
Key specs
- Complete pop-up drain assembly for standard lavatory drain openings
- Includes the drain body and lift rod connection
- Designed for Delta pop-up stopper systems
Pros
- Replacing the full assembly is simpler than repairing a worn linkage
- Addresses both slow drainage and stuck stoppers
- Helpful when the old drain body is corroded
Cons
- Requires removing the drain from below, which can be awkward in tight vanities
- Must match your drain size and style
Delta RP36382 Aerator
This part fits anyone seeing sputtering, uneven spray or weak flow from a lavatory spout. Aerators collect mineral deposits over time, and a fresh one is a quick, low-effort repair.
Key specs
- Replacement aerator sized for standard Delta lavatory spouts
- Threaded body that unscrews from the spout tip
- Flow-limiting design consistent with WaterSense-era lavatory faucets
Pros
- Quick fix that requires no tools in many cases
- Restores spray pattern after mineral buildup
- Low-cost maintenance item to keep on hand
Cons
- Not all Delta spouts use the same aerator thread, so verify first
- Does not address internal valve problems
Delta RP23836 Handle Kit
This is for owners replacing a cracked, loose or worn lever handle. A handle kit lets you restore the look and feel of the faucet without touching the valve body.
Key specs
- Lever handle with matching set screw and cap
- Designed for specific Delta single-handle lavatory models
- Finish should match the existing faucet
Pros
- Restores appearance without replacing the faucet
- Installs with a hex key in most cases
- Good option when the valve still works but the handle is damaged
Cons
- Finish can differ slightly from older faucets, so check photos and part numbers
- Only useful if the cartridge underneath is working
Delta RP39966 Stem Cartridge Kit
This suits owners of older two-handle lavatory faucets that drip from the hot or cold side. Compression-style valves use stems and washers instead of cartridges, so this kit is for a different fixture style than the single-handle parts above.
Key specs
- Stem-type component for two-handle compression designs
- Includes stem, seat and washer components
- Intended for specific Delta two-handle models
Pros
- Practical for older faucets that cannot be repaired with a single-handle cartridge
- Stem kits are often cheaper to replace than the whole faucet
- Clear identification by handle style and stem type
Cons
- Stem designs vary by year and series, so matching is critical
- Requires shutting off water and disassembling the handle
Delta RP50440 Supply Line Set
This is for anyone seeing moisture at the base of the faucet, or replacing older rubber supply hoses that have become brittle. Braided stainless lines are a common upgrade for their durability.
Key specs
- Braided stainless steel supply lines
- Compression fittings at the faucet and shutoff valve ends
- Standard lengths suited to most under-sink setups
Pros
- Braided construction resists bulging better than standard rubber hoses
- Replacing lines is a routine, low-risk task
- Useful preventive maintenance
Cons
- Length and fitting size must match your installation
- Overtightening compression nuts can crack fittings
Delta RP52570 Seal and O-Ring Kit
This assortment is aimed at owners fixing small leaks at the spout base or around the valve. Keeping a kit of seals on hand can prevent a minor leak from becoming a water-damage problem.
Key specs
- Assorted O-rings and seals for common Delta valve bodies
- Multiple sizes packaged together
- Silicone-based materials typical for faucet seals
Pros
- Inexpensive way to address minor leaks
- Covers several sizes in one package
- Useful as a maintenance stock item
Cons
- Requires matching the exact size, which can be guesswork without calipers
- Not a fix for worn valve bodies or cracked housings
Delta RP48894 Escutcheon Set
This fits owners with a worn or mismatched deck escutcheon, or whose faucet has been moved and left exposed holes. The escutcheon covers the mounting hole and gives the fixture a finished look.
Key specs
- Decorative escutcheon plate for lavatory deck mounting
- Finish intended to match Delta faucet lines
- Sized for standard deck hole diameters
Pros
- Covers unsightly or damaged deck holes
- Simple, tool-light installation
- Helpful when finish matching is a concern
Cons
- Finish match can vary under different lighting, so compare carefully
- Does not fix leaks or valve problems
Delta RP55320 Drain Stopper
This is for owners whose stopper is broken, missing or no longer lines up with the drain. A replacement stopper is often the simplest way to restore function to a pop-up or push-button drain.
Key specs
- Push-button style stopper for standard lavatory drains
- Designed to match common Delta drain openings
- Stopper head with matching finish
Pros
- Easy to install in many cases
- Restores sealing function without replacing the full drain
- Available in finishes matched to Delta faucets
Cons
- Stopper types vary, so confirm you have the push-button style
- Does not solve drain clogs caused by the trap or pipes
Buying Guide
Choosing the right delta lav faucet parts depends less on brand loyalty and more on identifying your exact faucet series. Delta has used many internal designs over the decades, and a part that looks similar can fail to seat, seal or thread correctly. Before buying, look for the model number printed on the faucet body, under the spout, or on the packaging of the original installation. Owners often report that a photo of the valve or the handle is also useful when checking compatibility.
Selection Criteria
- Exact model compatibility. Check the Delta model number and series against the part’s listed fit.
- Part type. Identify whether your faucet uses a cartridge, a stem, or a ceramic disc valve.
- Material quality. Brass bodies, ceramic discs and stainless braided lines are generally more durable than plastic substitutes.
- Finish match. Handles, escutcheons and stoppers should match the faucet finish.
- Documentation. Parts with clear diagrams and part numbers are easier to verify.
Important Features
For valve components, look for ceramic disc or well-sealed cartridge designs, since these are commonly associated with smoother operation and fewer drip problems. For drains, a complete pop-up assembly often solves more problems than a single linkage piece. For supply lines, braided stainless is a common choice for durability.
Specs to Check
- Delta model number and series name
- Cartridge or stem type (single-handle versus two-handle)
- Aerator thread size and spout style
- Supply line length and compression fitting size (commonly 3/8 inch on each end)
- Drain opening size and stopper style
Choosing by Need
- Dripping single-handle spout: start with the cartridge.
- Stiff or gritty handle: check the cartridge or ceramic disc valve first.
- Slow or stuck drain: replace the pop-up assembly or stopper.
- Weak or sputtering flow: clean or replace the aerator.
- Older two-handle faucet dripping: the stem kit is usually the right part.
Things to Watch Out For
The most common mistake is buying a part that fits the general Delta family but not your exact series. Shut off water supply valves before disassembling anything, and take photos as you go so you can reassemble correctly. Overtightening compression fittings can crack them, so tighten firmly but not forcefully. Mineral-heavy water can also degrade seals more quickly than expected. If you are unsure about gas lines, electrical work, or a faucet tied into a water heater, consult a licensed plumber.
FAQ
How do I find the correct Delta part number for my faucet?
Look for the model number on the faucet body, often on the underside of the spout or near the base. Delta’s own documentation also lists part numbers by model. If the faucet is hard to identify, photos of the valve and handle can help a parts specialist or plumber confirm the match.
Is a cartridge replacement better than replacing the whole faucet?
In many cases yes. If the faucet body and finish are in good shape, a cartridge is usually a more targeted repair. If the faucet is old, corroded or discontinued, replacement may be more practical. The right choice depends on the condition of the rest of the fixture.
Can I use a universal cartridge in any Delta faucet?
Universal cartridges exist, but they do not always seal or fit correctly. Delta cartridges are designed for specific valve housings, so matching the exact part number is the safer route.
How do I know if my aerator is clogged?
Signs include a sputtering spray, uneven stream or reduced flow. Unscrew the aerator from the spout tip, rinse out debris, and soak it in white vinegar if mineral deposits are visible. If the flow does not improve, replace it.
Why does my pop-up drain stop working?
The most common reasons are a loose or disconnected lift rod, a worn pivot nut, or a corroded pop-up body. Adjusting the clevis or replacing the pop-up assembly often restores function.
Do I need special tools to replace Delta lavatory parts?
Many jobs need only an adjustable wrench, a hex key set and a screwdriver. Cartridge removal may require a cartridge puller, and some compression fittings require a basin wrench in tight spaces. Gather tools before you start.
When should I call a professional?
If the leak is inside a wall, the shutoff valves are stuck or leaking, the faucet is connected to a complex plumbing system, or you are not comfortable working under a sink, consult a licensed plumber. Safety and water damage risks increase quickly when a repair goes wrong.
Conclusion
The best delta lav faucet parts are the ones that match your exact faucet series and address the actual failure. For single-handle drips, start with a cartridge such as the Delta RP19806 or RP46327, depending on your valve design. For stiff handles, check the ceramic disc option first. For slow drains, the Delta RP70000 pop-up assembly or the RP55320 stopper covers the most common problems. For weak flow, the RP36382 aerator is a simple fix. Older two-handle faucets generally need the RP39966 stem kit, and worn supply hoses are best replaced with the RP50440 braided set. Verify your model number before ordering, and keep a basic seal kit on hand for small leaks.
