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.

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

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