---
title: "Reviews — s3213 fuel water separator filter - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/s3213-fuel-water-separator-filter/reviews"
last_updated: "2026-08-05T21:21:32.069Z"
locale: en
meta:
  description: "Niche score 60/100 · $43K/yr market · 21K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 60/100 · $43K/yr market · 21K searches/yr. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Reviews — s3213 fuel water separator filter - Flapen"
---

# **s3213 fuel water separator filter**

**Worth a look**

Shows demand growing +124.8% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 11Growth 95Conversion 78Competition 41Returns 87Price range 89Avg price 95Brand share 56Review moat 95Quality gap 22

**Growth**

**Incredible****+124.8%**

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

**Review moat**

**Great****103.9**

avg incumbent reviews — the moat a new listing must climb

**Avg price**

**Incredible****$26.31**

avg listing price — sweet spot $15–$100

**Price range**

**Great****$10.60–$70.53**

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

**Returns**

**Great****1.4%**

return rate — above 5% kills the launch gate

**Conversion**

**Great****7.6%**

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

**Brand share**

**Good****71%**

top-5 brand share — brands hold most of the demand

**Competition**

**Okay****60%**

top-5 click share — leaders hold, buyers still browse

**Quality gap**

**Bad****4.7★**

avg incumbent rating — lower means beatable quality

**Market size**

**Bad****$43K**

$43K/yr · 21K searches

**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")

## Reviews