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.

romex splice kit

Skip it

Brand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.

Returns

Great1.3%

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

Good697.11

avg incumbent reviews — the moat a new listing must climb

Conversion

Okay3.8%

search→purchase rate — share of searches ending in a sale

Quality gap

Okay4.6★

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

Bad88%

top-5 click share — a locked-up shelf

Brand share

Bad98%

top-5 brand share — brand-locked demand

Signals Low Review Barrier

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

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

Top-5 brand share

98%

Top 20: 100%

Top-5 click share

88%

Top 20: 100%

Open market

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.

Open Trend

Top romex splice kit search terms

romex splice kit17K/yr +4.7%2.8% conv.
in wall splice kit14K/yr +10.6%2.4% conv.
in wall splice kit romex9K/yr -3.3%3.4% conv.
in wall romex splice kit6K/yr -37.9%3.2% conv.
romex splice kit in wall5K/yr -20.0%3.1% conv.
romex splice3K/yr -27.1%1.6% conv.
nsi splice kit3K/yr -34.1%6.3% conv.

All 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.

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

NSI Non-Metallic Cable Splice 12-14 AWG Wire Range for 3 Conductor Cable with Ground (Nms-3)

NSI$31.734.4★46 rev

NSI Non-Metallic Cable Splice 12-14 AWG Wire Range for 2 Conductor Cable with Ground White

NSI$22.754.6★93 rev

19045-1000 Self-Contained Power Connector Solid Nonmetallic Sheathed Cable 12-14 AWG COC-1

MLX$11.873.8★68 rev

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$27.544.7★73 rev

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$11.884.7★73 rev

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$27.5473 rev

9mo ago

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$11.8873 rev

9mo ago

MIARALA Black Open Splice Junction Box (6 Pack)

MIARALA$28.05416 rev

1y ago

WAGO 221 Lever Nuts 28pc Compact Splicing Wire Connector Assortment with Case | Includes 221-2401 221-412 221-413 221-415

Peppy Products$21.013,116 rev

2y ago

Rack-A-Tiers Open Splice Junction Box (Single) (UL Listed) Repair Open Splices 5 Second Installation Electrical Junction Box (JB400)

Rack-A-Tiers$11.83574 rev

3y ago

What buyers say about romex splice kit

What buyers praise and complain about, mined from review topics.

What buyers love

Ease Of Use26%

“Easy to use”

Quality-Overall14%

“These boxes appear to be of decent build quality based on the fit and finish”

Connectivity-Overall11%

“provides a strong connection”

Advertised Vs Actual Product10%

“As advertised”

Value For Money5%

“Good value”

Efficiency5%

“it made my wiring more efficient”

Design-Overall3%

“Great design”

Socket/Port/Plug2%

“These wire connectors are high-quality”

Strength2%

“The plastic case seems sturdy”

Assembly/Installation2%

“Easy install”

What buyers complain about

Value For Money15%

“Too expensive”

Connectivity-Overall9%

“Connecters are small”

Advertised Vs Actual Product8%

“Terrible representation of what you are getting”

Size-Overall7%

“Box is smaller than it seems”

Socket/Port/Plug6%

“The old connectors were plastic twist on caps”

Quality-Overall5%

“Definitely not high quality”

Ease Of Use3%

“Kinda hard to use due to how small they are”

Material Quality3%

“Admittedly, the plastic is average quality,”

Functionality-Overall3%

“They don't work”

Water Resistance3%

“They won't be water proof”

Top return reasons

Size-Overall29%

Compatibility-Overall10%

Advertised Vs Actual Product10%

Value For Money10%

Functionality-Overall8%

Defective Material/Parts7%

Socket/Port/Plug7%

Connectivity-Overall6%

Quality-Overall3%

Material Quality2%

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.