By Miles SinclairUpdated November 2026
If your Delta single handle faucet is dripping, sputtering or stuck in the wrong temperature setting, the cartridge is the most likely culprit, and a delta single handle faucet repair kit is the usual fix. The Danco Cartridge Repair Kit for Delta Single-Handle Faucet (model 86970) is a replacement cartridge aimed at homeowners who want to swap out the internal valve rather than the whole fixture. It suits people who already know their faucet is a Delta single-handle model and want a like-for-like part. It is a poor choice if you are unsure which Delta cartridge you have, if your faucet is a Delta two-handle or tub model, or if the leak is coming from the spout or base rather than the handle area.
Faucet Repair Kits, Cartridge Repair Kits, Faucet Cartridges, Single Handle Faucets, Brass/Plastic/Rubber/Steel Danco Cartridge Repair Kit for Delta Single-Handle Faucet, Brass (86970)
Product Overview
The Danco 86970 is a third-party cartridge intended to fit Delta single-handle kitchen and bathroom faucets. Its job is to control water flow and temperature mixing, which is the same role the original Delta cartridge plays. Because it is a replacement cartridge rather than a complete rebuild kit, it is typically paired with new O-rings and seals that are sometimes included in the package, and sometimes not, depending on the listing version. Check the contents before you order so you know whether you need to buy separate seals.
Delta has used several different cartridge families over the years, and fitment is the single most important factor. The listing name points to Delta single-handle faucets, but it does not guarantee a match with every model number Delta has produced. Owners generally recommend pulling the old cartridge and comparing it visually, including the stem height, the notch pattern on the bottom and the number of ports, before installing anything. The product is aimed at the do-it-yourself crowd who are comfortable with basic plumbing tools.
For context, many homeowners who go this route also read a general guide first. Our piece Delta Faucet Repair Kits: How to Choose and Use the Right One walks through how to identify the right part and why mismatched cartridges cause so many returns.
Key Features & Specifications
The table below lists only the details that the product name and common Delta single-handle design make clear. Manufacturers’ exact dimensions should be checked against your old cartridge before purchase.
| Feature | Details |
|---|---|
| Product type | Replacement faucet cartridge |
| Compatible faucet type | Delta single-handle faucets |
| Model number | Danco 86970 |
| Cartridge body material | Brass (per listing name) |
| Other listed materials | Plastic, rubber and steel components |
| Main function | Controls water flow and hot/cold mixing |
| Installation tools | Typically a screwdriver, Allen wrench or cartridge puller, depending on faucet |
Pros & Cons
Pros
- Brass cartridge body, which many owners prefer over all-plastic internals for durability.
- Replaces only the failing internal part, so you avoid buying a whole new faucet.
- Clearly labeled for Delta single-handle use, which narrows the search.
- Commonly used by DIY repairers, so installation guides and video walkthroughs are widely available.
Cons
- Fitment depends on the exact Delta model, and a wrong match wastes time.
- Seal and O-ring inclusion can vary, so you may need a separate seal kit.
- Not a universal part; it will not help with two-handle or tub faucets.
- Does not address leaks from the spout, aerator or base, which need different fixes.
Performance Analysis
Performance for a cartridge is mostly a question of whether it seals properly and gives smooth handle action. Owner feedback for replacement cartridges in this category tends to follow a consistent pattern. When the part matches the faucet, people generally report that the drip stops and the handle returns to smooth operation. When it does not match, the most common complaints are that the cartridge will not seat fully, the handle feels loose, or the hot and cold mix is off. These problems almost always trace back to fitment rather than build quality.
Brass bodies are generally viewed as more resistant to wear than plastic bodies, though the internal seals still determine most of the lifespan. Owners often advise replacing the O-rings at the same time, even if the old ones look intact, because they tend to harden. Mineral buildup from hard water is the other major factor. Soaking the faucet body in white vinegar before reinstalling is a common recommendation for clearing deposits that can cause stiff movement.
Manufacturers typically specify that installation should be done with the water supply shut off and the lines relieved of pressure. Following that step is the difference between a clean repair and a flooded cabinet.
Who Should Buy This Product?
This cartridge is a good fit for homeowners who have identified a Delta single-handle faucet, confirmed the model or cartridge type, and want an affordable internal replacement instead of a new fixture. It also suits anyone who has already done basic faucet work and is comfortable turning off supply valves and removing a retaining nut or clip. Budget-minded repairers often prefer this route to full replacement when the faucet body is still in good condition.
You should skip it if you cannot confirm your faucet is a Delta single-handle design, if your faucet is a Delta two-handle or bathtub model, or if the leak is at the spout or base. In those cases, a model-specific kit or a different part type will serve you better. If you are uncertain about shutting off water or working under a sink, consult a licensed plumber before proceeding.
Buying Guide
Before buying any delta single handle faucet repair kit, remove the handle and look at the cartridge. Note the stem height, the number of inlet and outlet ports, and any stamped model marks. Take a photo of the cartridge and compare it with the product listing images. Measure the cartridge height and diameter if you have calipers, since small differences in height can prevent proper seating. Also check whether the kit includes O-rings and a cap, or whether you need to buy a separate seal set.
Some common alternatives appear in the same search results. Each has its own fitment profile, so verify compatibility before ordering.
- Delta Faucet RP77739 Repair Kit – a Delta-branded kit that many owners choose when they want the manufacturer’s own part family. Check the model list in the listing carefully.
Delta Faucet RP77739 Repair Kit
- Delta Faucet RP77738 Bathroom Repair Kit, Chrome – a chrome-finish kit that is typically aimed at bathroom faucet applications. It is a better fit if your faucet is in a bathroom and matches its finish.
Delta Faucet RP77738 Bathroom Repair Kit, Chrome
For a broader look at how kits differ in design and use, see Delta Faucet Repair Kits: How to Choose and Use the Right One and Delta One Handle Kitchen Faucet Repair: Step-by-Step Fixes (2026), which covers the kitchen-specific steps.
FAQ
Will the Danco 86970 fit every Delta single-handle faucet?
No. Delta has produced many single-handle designs over several decades, and cartridges are not interchangeable across all models. Remove your old cartridge and compare its dimensions, port layout and stamped markings with the listing before buying.
Do I need to replace the O-rings when I install a new cartridge?
Owners commonly recommend it. O-rings harden and flatten over time, and replacing them during the cartridge swap reduces the chance of a leak returning shortly after the repair.
Why is my handle still stiff after installing the new cartridge?
Stiffness is often caused by mineral deposits in the faucet body or by a cartridge that is not fully seated. Clean the body with white vinegar, confirm the cartridge is oriented correctly and check that the retaining nut or clip is tight but not over-torqued.
Can this kit fix a dripping spout?
Usually not. A dripping spout often points to a worn cartridge, but it can also come from the aerator or a base seal. If the cartridge replacement does not stop the drip, inspect the other components.
Is this cartridge suitable for a Delta bathtub faucet?
Only if your tub faucet uses the same single-handle cartridge design. Many tub faucets use different valve types, so confirm the model before ordering.
Do I need to shut off the water supply?
Yes. Close the supply valves under the sink or at the main, then open the faucet briefly to relieve pressure. Manufacturers consistently specify this step to avoid water damage.
What if I am not sure which part I need?
Take the old cartridge to a hardware store or contact the faucet manufacturer with your model number. If you remain unsure, a licensed plumber can identify the correct part quickly and safely.
Final Verdict
The Danco 86970 is a sensible choice for owners who have confirmed they have a Delta single-handle faucet and need a replacement cartridge instead of a new fixture. Its brass body and clear compatibility labeling make it a practical option, provided you verify fitment against your old part first. For a deeper look at this model’s specifics, check the listing details and compare the included seals before buying.
Related reading
About Miles Sinclair
Miles Sinclair is part of our editorial team and reviews and edits our kitchen faucets & sinks guides, checking product details against manufacturer specifications and owner feedback.
