Is rp19804 profitable to sell on Amazon United States?

The niche generates $228K/yr across 9 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -0.1%. Flapen's verdict: Skip it (44/100).

How competitive is the rp19804 niche?

6 brands and 38 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 98% of demand.

What do buyers complain about in rp19804?

Top complaints mined from reviews: Size-Overall, Leak-Proof, Durability. The return rate is 8.8% — above our launch gate.

When does demand for rp19804 peak?

Demand is steady year-round — the busiest month runs 1.3× the quietest.

What does it cost to enter the rp19804 niche?

Listings span $14.96–$55.56; the average listing price is $24.03 (sweet spot $15–$100). The average incumbent carries 381 reviews — the moat a new listing must climb.

rp19804

Skip it

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

Conversion

Incredible12.4%

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

Avg price

Incredible$24.03

avg listing price — sweet spot $15–$100

Price range

Incredible$14.96–$55.56

cheapest to priciest tracked listing — scored on the share inside $15–$100

Review moat

Great381.33

avg incumbent reviews — the moat a new listing must climb

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Market size

Okay$228K

$228K/yr · 76K searches

Growth

Bad-0.1%

90-day search growth — must beat 0% to launch

Returns

Bad8.8%

return rate — above 5% kills the launch gate

Competition

Bad90%

top-5 click share — a locked-up shelf

Brand share

Bad98%

top-5 brand share — brand-locked demand

Signals Low Review Barrier High Returns

According to Flapen's Amazon United States niche tracking, rp19804 is a $228K/yr Amazon United States market (76K searches/yr). The top 5 brands hold 98% of demand. Verdict: Skip it — 44/100.

Data updated Jul 29, 2026 · scored weekly · How we score niches

rp19804 market data

Units sold / yr: 10K–13K; avg 1,000–1,250/product
Revenue / yr: $240K–$300K; units × avg price
Conversion rate: 12.4%
Avg BSR: #119
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 0.0%
Avg brand age: 32 months
Avg seller age: 155 days

Competition & brand share

The top 5 products capture 90% 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

90%

Top 20: 100%

Open market

Sxtrrdnary42%
DELTA30%
LOWCUS20%
GHAKUTB3%
M Motico2%
Wairool2%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -0.1% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top rp19804 search terms

rp1980418K/yr +2.4%10.8% conv.
delta rp1980415K/yr +7.2%12.2% conv.
rp19804 delta shower cartridge14K/yr -4.6%13.0% conv.
delta 1400 series cartridge10K/yr -0.5%8.5% conv.
delta rp19804 cartridge7K/yr -9.3%12.9% conv.
delta 1300/1400 series cartridge4K/yr +3.5%7.2% conv.
delta cartridge rp198043K/yr +9.4%10.1% conv.
delta rp19804 replacement cartridge3K/yr +6.2%13.6% conv.
delta monitor 1400 series cartridge3K/yr -17.2%9.7% conv.

All search terms

Top rp19804 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

RP19804 Shower Cartridge Compatible with Delta 1300/1400 Series Single Handle Tub Bathtub Shower Faucet Replacement for Delta Monitor Cartridge Repair Plumbing Parts RP22734 Bonnet Nut (1993-2007)

Sxtrrdnary$20.904.2★345 rev

Delta Faucet RP19804 1300/1400 Series Catridge Assembly Small

DELTA$55.564.5★1,820 rev

LOWCUS Shower Cartridge Replacement for Delta RP19804 (04/2006 Earlier) 1-Pack Fits Delta Monitor 1300 1400 Series Single Handle Fix Leak or Drip Temperature or Pressure Issues Includes Bonnet Nut

LOWCUS$21.454.2★251 rev

LOWCUS Shower Cartridge Replacement for Delta RP19804 (04/2006 Earlier) 1-Pack Fits Delta Monitor 1300 1400 Series Single Handle Fix Leak or Drip Temperature or Pressure Issues Scald Guard

LOWCUS$19.474.2★251 rev

RP19804 Shower Cartridge Compatible with Delta 1300/1400 Series Single Handle Tub Bathtub Shower Faucet Replacement for Delta Monitor Cartridge Repair Plumbing Parts

Sxtrrdnary$19.134.3★72 rev

Newest

by launch date

LOWCUS Shower Cartridge Replacement for Delta RP19804 (04/2006 Earlier) 1-Pack Fits Delta Monitor 1300 1400 Series Single Handle Fix Leak or Drip Temperature or Pressure Issues Includes Bonnet Nut

LOWCUS$21.45251 rev

10mo ago

LOWCUS Shower Cartridge Replacement for Delta RP19804 (04/2006 Earlier) 1-Pack Fits Delta Monitor 1300 1400 Series Single Handle Fix Leak or Drip Temperature or Pressure Issues Scald Guard

LOWCUS$19.47251 rev

10mo ago

RP19804 Shower Cartridge Compatible with Delta 1300/1400 Series Single Handle Tub Bathtub Shower Faucet Replacement for Delta Monitor Cartridge Repair Plumbing Parts RP22734 Bonnet Nut (1993-2007)

Sxtrrdnary$20.90345 rev

1y ago

RP19804 Shower Cartridge Compatible with Delta 1300/1400 Series Single Handle Tub Bathtub Shower Faucet Replacement for Delta Monitor Cartridge Repair Plumbing Parts

Sxtrrdnary$19.1372 rev

1y ago

RP19804 Shower Cartridge Assembly Shower Valve Cartridge Replacement for 1300/1400 Series Tub and Shower Pressure Balance Cartridge Compatible with Single-Handle Monitor Shower (1993~2007) 2PCS

M Motico$27.8657 rev

3y ago

What buyers say about rp19804

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

What buyers love

Size-Overall22%

“Fit perfect”

Leak-Proof18%

“It fits and doesn't leak”

Value For Money15%

“Good deal”

Assembly/Installation13%

“Easy enough to install”

Quality-Overall9%

“Quality cartridge”

Advertised Vs Actual Product5%

“works as advertised”

Efficiency3%

“Works great”

Ease Of Use2%

“Easy Peezy”

Pressure2%

“Water pressure is better than its been in years”

Durability1%

“It does feel durable”

What buyers complain about

Size-Overall23%

“of this product is too big”

Leak-Proof15%

“Started leaking quickly and made a big mess”

Durability7%

“Easily broken”

Value For Money7%

“Although it is quite expensive for what it is”

Assembly/Installation7%

“could not install”

Functionality-Overall4%

“It didnt work for me”

Quality-Overall4%

“Poorly quality, does not fit”

Compatibility-Overall3%

“It did not fit my pre 2006 RP 19804”

Product Condition3%

“Return resold”

Defective Material/Parts2%

“This part is junk”

Top return reasons

Size-Overall57%

Compatibility-Overall19%

Defective Material/Parts5%

Leak-Proof4%

Assembly/Installation4%

Functionality-Overall3%

Advertised Vs Actual Product3%

Product Condition2%

Value For Money1%

Maintenance And Repair1%

Common questions

Is rp19804 profitable to sell on Amazon United States?: The niche generates $228K/yr across 9 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -0.1%. Flapen's verdict: Skip it (44/100).
How competitive is the rp19804 niche?: 6 brands and 38 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 98% of demand.
What do buyers complain about in rp19804?: Top complaints mined from reviews: Size-Overall, Leak-Proof, Durability. The return rate is 8.8% — above our launch gate.
When does demand for rp19804 peak?: Demand is steady year-round — the busiest month runs 1.3× the quietest.
What does it cost to enter the rp19804 niche?: Listings span $14.96–$55.56; the average listing price is $24.03 (sweet spot $15–$100). The average incumbent carries 381 reviews — the moat a new listing must climb.