PlumbingInstallation & Assembly4HighHomeowner / DIYer$ implied

After tile installation, the toilet flange is 1/2 inch below finished floor; old cast iron flange with imperfections and internal lip won't accept common extension methods because it is pipe-supported with no subfloor access for screws.

These products assume a flange on flat subfloor; they don't work with pipe-supported cast iron flanges that have an internal lip and are set below tile.

Opp. Score

Severity

4High

Willingness to Pay

implied

Added

Jun 23, 2026

App Concept

CastFlex Flange Extender

A universal flange extension kit that adapts to cast iron flanges, even those with internal lips and no subfloor access. Uses a flexible gasket and threaded collar to seal and extend without screws or subfloor mounting.

Key Features

Adjustable height extension up to 1 inch
Flexible silicone gasket conforms to imperfect cast iron surfaces
No subfloor screws needed; clamps onto pipe and flange
Includes spacers for internal lip clearance

Target Users: DIY homeowners and plumbers working on old cast iron toilet flanges installed directly on pipe, especially after floor retiling.

Revenue Model: $34.99 per kit one-time purchase, available at hardware stores and online

Existing Solutions Mentioned

Oatey Set-Rite extensionPVC ringsDanco perfect seal

Part of App Idea

FlexiFlange Pro

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