---
title: "Romex Splice Kit — $44K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/electronics/romex-splice-kit"
last_updated: "2026-08-11T15:23:10.130Z"
locale: en
meta:
description: "Niche score 36/100 · $44K/yr market · 57K searches/yr · $20.21 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 36/100 · $44K/yr market · 57K searches/yr · $20.21 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Romex Splice Kit — $44K/yr Amazon US Niche (2026) - Flapen"
---
# **romex splice kit**
**Skip it**
Brand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.
Market size 11Growth 22Conversion 48Competition 10Returns 88Price range 82Avg price 88Brand share 6Review moat 70Quality gap 32
**Returns**
**Great****1.3%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$20.21**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$11.83–$31.73**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****697.11**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Okay****3.8%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-5.7%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$44K**
$44K/yr · 57K searches
**Competition**
**Bad****88%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****98%**
top-5 brand share — brand-locked demand
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, romex splice kit is a $44K/yr Amazon United States market (57K searches/yr). The top 5 brands hold 98% of demand. Verdict: Skip it — 36/100.
Data updated Jul 22, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **romex splice kit market data**
- **Units sold / yr**
- **3K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$51K–$61K**
- units × avg price
- **Conversion rate**
- **3.8%**
- **Avg BSR**
- **#115**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **67%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **42 months**
- **Avg seller age**
- **141 days**
## **Competition & brand share**
The top 5 products capture 88% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **▼falling
**Sellers**
**50**
**Top-5 brand share**
**98%**
Top 20: 100%
**Top-5 click share**
**88%**
Top 20: 100%
**Open market**
**0%**
- NSI64% - MLX16% - Generic8% - Peppy Products6% - MIARALA4% - Rack-A-Tiers2%
## **Demand**
Weekly Amazon search volume, last 17 weeks — -5.7% search growth over the last 90 days.
1K750Spike '26Mar '26Apr '26Apr '26May '26May '26Jun '26Jun '26Jul '26Jul '26
[**Open Trend **](https://flapen.com/research/us/electronics/romex-splice-kit/trend)
## **Top romex splice kit search terms**
- **romex splice kit**17K/yr+4.7%2.8% conv. - **in wall splice kit**14K/yr+10.6%2.4% conv. - **in wall splice kit romex**9K/yr-3.3%3.4% conv. - **in wall romex splice kit**6K/yr-37.9%3.2% conv. - **romex splice kit in wall**5K/yr-20.0%3.1% conv. - **romex splice**3K/yr-27.1%1.6% conv. - **nsi splice kit**3K/yr-34.1%6.3% conv. [**All search terms **](https://flapen.com/research/us/electronics/romex-splice-kit/search-terms)
## **Top romex splice kit products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$4K20%$9K30%$13K40%$17K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 9 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NSI Non-Metallic Cable Splice 12-14 AWG Wire Range for 3 Conductor Cable with Ground (Nms-3)**NSI**$31.73**4.4★46 rev](https://www.amazon.com/dp/B00CTTMO7M) [2**NSI Non-Metallic Cable Splice 12-14 AWG Wire Range for 2 Conductor Cable with Ground White**NSI**$22.75**4.6★93 rev](https://www.amazon.com/dp/B00CTTMM2Y) [3**19045-1000 Self-Contained Power Connector Solid Nonmetallic Sheathed Cable 12-14 AWG COC-1**MLX**$11.87**3.8★68 rev](https://www.amazon.com/dp/B09ZRQJ77M) [4**Open Splice Junction Box 5-Pack | UL 514C | One-Piece Polycarbonate Box Code-Approved Durable DIY Electrical Splice Enclosure in Black | Fast Installation for Safe Wiring Connections**Generic**$27.54**4.7★73 rev](https://www.amazon.com/dp/B0FXS127YZ) [5**Open Splice Junction Box 2-Pack | UL 514C | One-Piece Polycarbonate Box Code-Approved Durable DIY Electrical Splice Enclosure in Black | Fast Installation for Safe Wiring Connections**Generic**$11.88**4.7★73 rev](https://www.amazon.com/dp/B0FXS4JTBV)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Open Splice Junction Box 5-Pack | UL 514C | One-Piece Polycarbonate Box Code-Approved Durable DIY Electrical Splice Enclosure in Black | Fast Installation for Safe Wiring Connections**Generic**$27.54**73 rev9mo ago](https://www.amazon.com/dp/B0FXS127YZ) [**Open Splice Junction Box 2-Pack | UL 514C | One-Piece Polycarbonate Box Code-Approved Durable DIY Electrical Splice Enclosure in Black | Fast Installation for Safe Wiring Connections**Generic**$11.88**73 rev9mo ago](https://www.amazon.com/dp/B0FXS4JTBV) [**MIARALA Black Open Splice Junction Box (6 Pack)**MIARALA**$28.05**416 rev1y ago](https://www.amazon.com/dp/B0DRCYR13Z) [**WAGO 221 Lever Nuts 28pc Compact Splicing Wire Connector Assortment with Case | Includes 221-2401 221-412 221-413 221-415**Peppy Products**$21.01**3,116 rev2y ago](https://www.amazon.com/dp/B0CJ5QF3VX) [**Rack-A-Tiers Open Splice Junction Box (Single) (UL Listed) Repair Open Splices 5 Second Installation Electrical Junction Box (JB400)**Rack-A-Tiers**$11.83**574 rev3y ago](https://www.amazon.com/dp/B0C765NZB2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Open Splice Junction Box 5-Pack | UL 514C | One-Piece Polycarbonate Box Code-Approved Durable DIY Electrical Splice Enclosure in Black | Fast Installation for Safe Wiring Connections**Generic**$27.54**4.7★**▲ 209%**](https://www.amazon.com/dp/B0FXS127YZ) [**NSI Non-Metallic Cable Splice 12-14 AWG Wire Range for 2 Conductor Cable with Ground White**NSI**$22.75**4.6★**▲ 70%**](https://www.amazon.com/dp/B00CTTMM2Y) [**Open Splice Junction Box 2-Pack | UL 514C | One-Piece Polycarbonate Box Code-Approved Durable DIY Electrical Splice Enclosure in Black | Fast Installation for Safe Wiring Connections**Generic**$11.88**4.7★**▲ 34%**](https://www.amazon.com/dp/B0FXS4JTBV) [**NSI Non-Metallic Cable Splice 12-14 AWG Wire Range for 3 Conductor Cable with Ground (Nms-3)**NSI**$31.73**4.4★**▲ 12%**](https://www.amazon.com/dp/B00CTTMO7M) [**WAGO 221 Lever Nuts 28pc Compact Splicing Wire Connector Assortment with Case | Includes 221-2401 221-412 221-413 221-415**Peppy Products**$21.01**4.8★**— 8%**](https://www.amazon.com/dp/B0CJ5QF3VX)
**~~View all trending →~~**
## **What buyers say about romex splice kit**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Ease Of Use**26%
*“Easy to use”*
**Quality-Overall**14%
*“These boxes appear to be of decent build quality based on the fit and finish”*
**Connectivity-Overall**11%
*“provides a strong connection”*
**Advertised Vs Actual Product**10%
*“As advertised”*
**Value For Money**5%
*“Good value”*
**Efficiency**5%
*“it made my wiring more efficient”*
**Design-Overall**3%
*“Great design”*
**Socket/Port/Plug**2%
*“These wire connectors are high-quality”*
**Strength**2%
*“The plastic case seems sturdy”*
**Assembly/Installation**2%
*“Easy install”*
### **What buyers complain about **
**Value For Money**15%
*“Too expensive”*
**Connectivity-Overall**9%
*“Connecters are small”*
**Advertised Vs Actual Product**8%
*“Terrible representation of what you are getting”*
**Size-Overall**7%
*“Box is smaller than it seems”*
**Socket/Port/Plug**6%
*“The old connectors were plastic twist on caps”*
**Quality-Overall**5%
*“Definitely not high quality”*
**Ease Of Use**3%
*“Kinda hard to use due to how small they are”*
**Material Quality**3%
*“Admittedly, the plastic is average quality,”*
**Functionality-Overall**3%
*“They don't work”*
**Water Resistance**3%
*“They won't be water proof”*
### **Top return reasons **
**Size-Overall**29%
**Compatibility-Overall**10%
**Advertised Vs Actual Product**10%
**Value For Money**10%
**Functionality-Overall**8%
**Defective Material/Parts**7%
**Socket/Port/Plug**7%
**Connectivity-Overall**6%
**Quality-Overall**3%
**Material Quality**2%
## **Common questions**
- **Is romex splice kit profitable to sell on Amazon United States?**
- The niche generates $44K/yr across 9 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -5.7%. Flapen's verdict: Skip it (36/100).
- **How competitive is the romex splice kit niche?**
- 6 brands and 50 sellers compete. The top 5 products take 88% of clicks and top 5 brands hold 98% of demand.
- **What do buyers complain about in romex splice kit?**
- Top complaints mined from reviews: Value For Money, Connectivity-Overall, Advertised Vs Actual Product. The return rate is 1.3%.
- **What does it cost to enter the romex splice kit niche?**
- Listings span $11.83–$31.73; the average listing price is $20.21 (sweet spot $15–$100). The average incumbent carries 697 reviews — the moat a new listing must climb.
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