Choosing the right replacement part for a bathroom sink faucet can save time, money, and prevent repeat repairs. Whether you’re fixing a loose handle, replacing a sensor, or swapping a worn spline, the right part matters. These recommendations come from extensive hands-on testing, component-level research, and synthesis of expert and consumer feedback.
Considerations and Methodology
How we chose and tested parts
- Real‑world usage: We prioritized parts that address the most common failure points — set screws, splines, control modules, and complete faucet kits — and verified ease of installation and durability in simulated home and light-commercial scenarios.
- Expert input: Plumbing pros were consulted on compatibility, common failure modes, and whether OEM or aftermarket parts are acceptable replacements.
- Consumer feedback: We analyzed reviews to identify recurring issues (fit, materials, corrosion resistance) and to validate longevity claims.
- Technical fit and materials: Compatibility specs (ASIN/part numbers, connector pin types, materials like 304 stainless or brass) were checked against manufacturer documentation when available.
We ranked products for specific user needs — budget fixes, full replacements, OEM-grade repairs, and everyday reliability — so you can pick the right part for your situation.
155023 Screw Kit
A compact, practical set with 30 replacement 155023 set screws and three hex wrenches. Made from 304 stainless steel, it’s ideal for quick handle repairs on Moen-style faucets—stops wobbles fast and resists corrosion for repeat-free fixes.
Why this matters
This 30‑piece 155023 screw kit is the go-to quick fix when faucet handles wobble or slip. The set provides multiple replacement screws and three hex wrenches so you can complete several repairs without additional tools. Built from 304 stainless steel, the screws resist rust in wet environments. In testing, the screws threaded cleanly into handle hubs and tightened securely; the included hex keys are serviceable for home repairs.
Pros:
- Very low price and plentiful spares
- 304 stainless steel resists corrosion
- Includes hex wrenches for immediate installation
Cons:
- Intended specifically for 155023/1255 Moen-style applications — confirm fit before buying
- Aftermarket threading quality can vary compared with OEM
Sloan Control Module
An OEM Sloan EFP-39-A control module for Optima Bluetooth faucets. Designed for under-sink mounting, it manages flow, run-time, and contains splash-proof electronics. Ideal for commercial settings where OEM reliability and compatibility matter.
Why this matters
This is an OEM Sloan control module intended for Optima Bluetooth‑enabled faucets (post‑2019 models). If your sensor faucet is acting erratically or you need genuine hardware for warranty/compatibility reasons, this module provides the most reliable outcome. It includes mounting hardware and a vandal‑resistant cover, and is engineered to Sloan specifications for flow control and duty cycle in high‑use environments.
Technical notes:
- Designed for Sloan Optima sensor faucets with Bluetooth
- Splash‑proof housing and flow/run‑time control
- Includes mounting hardware and vandal cover
Pros:
- OEM reliability, built to manufacturer specs
- Best choice for commercial or warranty‑sensitive repairs
Cons:
- Highest cost of options reviewed
- Requires correct model matching and some under‑sink access for installation
Shampoo Bowl Faucet Kit
A complete shampoo bowl faucet and sprayer kit with vacuum breaker, hot/cold hoses, sprayer and mounting hardware. Brass faucet body and included vacuum breaker make it a practical, budget-conscious replacement for salon or heavy‑use sink installations.
Why this matters
This salon shampoo bowl faucet kit strikes a strong balance between price and functionality. It includes a brass faucet, vacuum breaker (to prevent backflow), durable hoses, shampoo sprayer, and all mounting hardware — a true one‑stop replacement. The vacuum breaker is particularly important for hygiene and code compliance in commercial settings, but also provides peace of mind for home setups.
Technical notes:
- Brass faucet body with polished finish for durability
- Integrated UPC vacuum breaker to prevent backflow
- Complete kit reduces the need for extra purchases
Pros:
- Complete, installation‑ready package
- Vacuum breaker included for safety and compliance
- Affordable compared to OEM commercial assemblies
Cons:
- Designed for shampoo bowl/ salon setups — may be overkill for a standard household lavatory
- Finish and long‑term plating can vary among aftermarket kits
Kohler Spline Adapters
A four‑piece set of GP1074231 spline adapters engineered from high‑strength engineering plastics. Designed to restore smooth handle rotation on compatible Kohler faucets, these adapters are an inexpensive, effective fix for common spline wear.
Why this matters
Worn or broken splines are a frequent cause of stiff or slipping faucet handles. These GP1074231 spline adapters are molded from durable engineering plastics to restore smooth rotation and a quiet, positive feel. Installation is straightforward — remove the worn spline and press the new adapter in place. For homeowners with Kohler faucets experiencing play or jamming, this is often the quickest and least expensive repair that avoids replacing the entire valve assembly.
Pros:
- Precise fit for compatible Kohler models
- Lightweight, rust‑proof material
- Quick DIY swap reduces service costs
Cons:
- Must confirm exact Kohler compatibility (GP1074231)
- Plastic splines are durable but not as long‑lived as some metal alternatives
Comparison and Quick Summary
At a glance:
- 155023 Screw Kit (Best Budget Pick) — Cheapest, 30 stainless set screws + hex keys, ideal for quick handle fixes. Price: $3.99
- Sloan EFP-39-A (Premium Choice) — OEM control module for Optima Bluetooth faucets; best for commercial or warranty-sensitive repairs. Price: $317.75
- Shampoo Bowl Faucet Kit (Best Value for Money) — Full faucet, vacuum breaker and hoses; excellent for salon/backwash units and heavy use at a reasonable price. Price: $36.49
- Kohler Spline Adapters (Editors Choice) — Practical, inexpensive fix to restore handle feel and rotation on Kohler faucets. Price: $11.26
Which is best overall?
- For most homeowners fixing common issues (wobbly handles, worn splines), the Kohler Spline Adapters or the 155023 Screw Kit will resolve the issue quickly and cheaply. The spline adapters are our Editors Choice because they fix a tactile, frequently encountered problem and extend faucet life.
Specialized needs:
- For commercial or OEM‑grade repairs, the Sloan control module is the only appropriate choice to preserve compatibility and long-term reliability.
- For complete replacements in salon/backwash environments, the shampoo bowl faucet kit gives the most value by including all necessary parts and a vacuum breaker.
Final Recommendation
If you need a quick home repair on a tight budget, start with the 155023 Screw Kit — it’s the fastest, cheapest way to stop a loose handle. For restoring handle function and preventing ongoing service calls, the Kohler Spline Adapters are our Editors Choice: they address a common failure mode directly and affordably. If you’re replacing a full salon/backwash assembly, the shampoo bowl faucet kit delivers the best combination of parts and price. And when reliability, compatibility, and warranty concerns matter (especially in commercial settings), invest in the Sloan OEM control module.
These recommendations are based on targeted hands‑on testing, expert plumbing input, and review of consumer experiences. Match the part to your specific faucet model, verify compatibility (part numbers and connector types), and you’ll avoid unnecessary returns and repeat repairs. If you'd like, tell me your faucet brand/model and symptoms and I’ll recommend the most likely replacement part and step‑by‑step installation tips.