Petro-Plugs® | Drain Filters

Easily Installed and Easily Removed SPI Petro-Plugs

Solidification Products International Petro-Plugs are easy to install. Our 3-inch Petro-Plugs are designed to simply slide into standard 3-inch pipe drains and our 4-inch Petro-Plugs fit right into 4-inch pipe drains.

Featuring a proprietary twist-and-lock system that provides a watertight seal without any sealants, the Petro-Plug is also designed for easy removal, allowing temporary unrestricted discharge of uncontaminated water.

SPI Petro-Plug Drawings and Applications

The Petro-Plug was designed for indoor applications with a low flow rate of water. The original Petro-Plugs were manufactured to fit 3- and 4-inch floor drains.

These Petro-Plugs have a unique mounting flange design. Only the bottom mounting ring is permanently bonded to the outer diameter of the drain with construction adhesive. The top mounting flange, attached to the Petro-Plug itself, attaches directly to the bottom mounting ring with a proprietary twist-and-lock mechanism.

An O-ring between the two flanges makes a water/oil-tight seal. The Petro-Plug can then be removed without tools in an emergency, then re-inserted to again provide complete oil containment protection and water drainage.

Additional Uses for Our Petro-Plugs

The 3” and 4” Petro-Plugs are sometimes used in outdoor applications for small containment areas, usually under 200 square feet. In these applications, it is necessary to install a top hat filter, as shown in the picture below.

The top hat filter cleans the rainwater, trapping dirt and debris before it reaches the Petro-Plug.

The picture above shows the different sized 3” and 4” Petro-Plugs with lengths of 6, 8 and 10 inches. The picture to the right illustrates the flow rate through a 4” Petro-Plug with 4” of head pressure at about 5 quarts per minute.

Potential oil spills in floor drains have been a great concern for schools, hospitals and many buildings throughout the Northeastern United States, where fuel oil is used as the primary heating source.

Petro-Plugs are made to fit both 3” and 4″ floor drains, allowing the water from the boiler to drain, while preventing any oil from escaping in the event of a spill. These pictures show the ease of installation of a typical Petro-Plug.

How Does an SPI Petro-Plug Work?

Petro-Plugs are disposable oil barriers that are more effective and less expensive than oil/water separators.

Designed to fit standard piped floor drains in boiler rooms, garages, warehouses, oil storage areas, and underground vaults, the Petro-Plug removes low levels of diesel, gasoline, and oils while allowing water to flow through as usual.

Depending on the drain diameter, Petro-Plugs installed in vertical drains have a flow rate of about 1-3 gallons per minute. Uncontaminated water drains at approximately 5 quarts per minute with standard-sized floor drains.

If an oil spill occurs, the Petro-Plug seals off completely, shutting down any discharge into sewer lines, sump pits, oil/water separators, catch basins, etc., allowing spills to be cleaned up at the source and saving thousands of dollars in cleanup costs and fines.