PlumbingTooling & Equipment3MediumPlumber$ implied
Plumber needs a compression donut that fits a 3 1/8 inch cast iron coupling but the standard 3x2 donut is too large at 3 3/4 inches, and is seeking alternative options.
Standard donuts are sized for nominal pipe dimensions, but actual cast iron IDs vary, leaving a gap for odd sizes.
44
0
Opp. Score
44
Severity
3Medium
Willingness to Pay
implied
Added
Apr 30, 2026
App Concept
FitDonut Custom Sizing
A web app that helps plumbers find the exact donut or adapter for non-standard pipe sizes by inputting actual measurements, with a database of odd-sized fittings and custom fabrication options. No more guessing or returns.
Key Features
- Pipe measurement input (ID/OD) with unit toggle
- Compatibility database of donuts and adapters for odd sizes
- Direct ordering of correctly sized or custom donuts
- Return/exchange handling integrated for wrong-size purchases
Target Users: Plumbers and pipefitters in home services and construction who deal with old or non-standard pipe sizes
Revenue Model: Commission on each donut ordered (10% markup) plus $19.99/month for a pro subscription with unlimited access to custom sizing and expedited shipping
Existing Solutions Mentioned
Fernco Compression Donut P33U-205
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