Cannot find a drain assembly that fits a custom vessel sink with a 1.25-inch drain hole because standard parts have larger threads.

Standard plumbing parts are designed for common hole sizes; custom or unconventional sizes are not served by off-the-shelf products, requiring time-consuming manual search or custom fabrication.

Opp. Score

Severity

3Medium

Willingness to Pay

implied

Added

May 19, 2026

Workarounds Described

searches for standard parts that don't fit
posts on forums for help

Implied Software Gaps

A filtered product search database for non-standard sink drain sizes

App Concept

CustomDrain Finder

An online database and marketplace that matches users with drain assemblies for non-standard sink hole sizes. Users input their sink hole diameter and get a curated list of compatible products from multiple brands, with filters for material, finish, and price. Includes verified compatibility checks and user reviews.

Key Features

Search by exact hole diameter (fractional and metric)
Filter by material, finish, and price range
Compatibility verification with user-uploaded photos
Links to purchase from multiple retailers

Target Users: DIY homeowners and small plumbing contractors dealing with custom or imported sinks

Revenue Model: Freemium with $4.99/month pro tier for unlimited searches and priority support; affiliate commissions from retailer links

Part of App Idea

Cannot find a drain assembly that fits a custom vessel sink with a 1.25-inch drain hole because standard parts have larger threads.

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