The terms overlap in everyday use. Municipal codes may use size and flow definitions that differ from those used by manufacturers and contractors.
What a smaller trap does
A small hydromechanical grease interceptor is often installed near kitchen equipment and works by controlling wastewater flow and retaining grease and food solids.
It must remain accessible for inspections and cleaning; a compact device can fill quickly in a high-output kitchen.
What a larger interceptor does
An outdoor gravity interceptor often serves multiple fixtures and stores more wastewater and captured waste. Multi-chamber access and pumping equipment may be needed.
Tampa’s definitions use flow and storage capacity to distinguish devices; other jurisdictions use different terminology.
What matters before booking
Locate the device, note manufacturer/model, identify the capacity from plans or markings and photograph access points.
Do not assume a provider equipped for a small indoor unit can safely and legally transport the contents of a large interceptor.
Compliance first
The label on a quote does not determine the rule. Your specific device and jurisdiction do.
If records are missing, ask the building owner, plumbing contractor or utility FOG program to help identify the installation.
A practical next step
Use the relevant planner, compare service requirements with your facility records, and obtain a written quote before authorizing work. Keep the municipal source and your own permit conditions alongside contractor documentation.