The AFL Oil Stop Valve (OSV) is designed to prevent a major oil spill. The OSV is available from AFL prepackaged in a fiberglass or steel catch basin or as an option on AFL Oil/Water Separators. The OSV is also available separately for installation in existing separators, catch basins or manholes. A partial listing of major companies currently using the AFL Oil Stop Valve is shown below.
| Chemicals | |
| ALLIED CHEMICAL | BATSON-COOK CO. MOBILE CHEMICALS |
| BURRIS CHEMICAL | CARGILL CORPORATION |
| E. I. DUPONT | G. D. SEARLE |
| JOHN E. GREEN CO. | SEARLE CHEMICAL |
| SURPASS CHEMICAL | TEXAS, INC. |
| Food | |
| ACME MARKETS | BURGER KING DISTRON |
| CARGILL, INC. | COCA COLA |
| COSTCO | CRISPY PIZZA |
| FRIENDLY FOOD MART | FRITO-LAY |
| PIONEER AGRAGATE | PROCTOR & GAMBLE |
| PUBLICKER, INC. | STOP & SHOP |
| WAREMART FOODS | WINN-DIXIE |
| Metals, Fabricated Primary | |
| ACME STEEL | ALCOA |
| BHP STEEL MILL | CASCADE STEEL |
| GENERAL ELECTRIC | HUNTINGTON ALLOYS, INC. |
CHAMPION BUILDING PRODUCTSGENERAL ELECTRIC
| Machinery | |
| GENERAL MOTORS | VULCAN-BRUNGAR EQUIPMENT |
| Petroleum | |
| CARGILL, INC | EVERGREEN OIL, INC. |
| GATX TERMINALS CORP. | GULF OIL CANADA |
| IMPERIAL OIL LTD. | RAYMER OIL |
| Pulp & Paper | |
| GEORGIA PACIFIC | MEAD PAPER CO. |
| REED PAPER CO. | SCOTT PAPER |
| WEYERHAEUSER CO. | |
| Transportation Services (Airports) | |
| ADIRONDACK REGIONAL AIRPORT | BIRMINGHAM MUNICIPAL AIRPORT |
| BOEING | BROOME COUNTY AIRPORT |
| DOUBLE DIAMOND AVIATION | EDWARD F. KNAPP AIRPORT |
| GRUMMAN AEROSPACE | LANMAR AVIATION |
| MASSPORT | OXFORD/HENDERSON AIRPORT |
| SIGNATURE FLIGHT SUPPORT | TAUGHANNOCK AVIATION |
| WASHINGTON DC AIRPORT | |
| Utilities | |
| ABB | ABEX CORP. |
| ALASKA ELECTRIC LIGHT | ALSTOM POWER |
| ASSOCIATED ELECTRIC | B.C. HYDRO PLANT |
| BONNEVILLE POWER ADMINISTRATION | BOSTON EDISON CO. |
| CALPINE COGENERATION | CAROLINA POWER & LIGHT |
| CENTRAL ILLINOIS PUBLIC SERVICE CO. | CLARK PRODUCTS |
| COMMONWEALTH EDISON CINCINNATI GAS & ELECTRIC |
CONECTIV CONSOLIDATED EDISON CO. N.Y. |
| CORN BELT ELECTRIC CO-OP | CENTRAL VIRGINIA ELECTRIC |
| DAMON C. DOUGLAS CO. | DAYTON POWER & LIGHT |
| DELMARVA POWER | DUKE POWER |
| DOMINION VIRGINIA POWER | EAST KENTUCKY POWER |
| FLORIDA POWER & LIGHT | GULF STATE UTILITIES |
| GEORGIA POWER CO. | HYDROQUEBEC |
| GREENEVILLE LIGHT & POWER ILLINOIS POWER |
KAUAI ELECTRIC KANSAS POWER & LIGHT CO. |
| KINDER MORGAN POWER | LEE COUNTY ELECTRIC |
| LOUISVILLE GAS & ELECTRIC | MURRAY HYDROELECTRIC |
| MEAG POWER OREGON ELECTRIC |
OWENSBORO MUNICIPAL UTILITIES PACIFIC GAS & ELECTRIC |
| PACIFIC POWER & LIGHT | PANELEC |
| PENNSYLVANIA POWER CO. | PHILADELPHIA ELECTRIC CO. |
| PORTLAND GENERAL ELECTRIC | POWER AUTHORITY OF NEW YORK |
| PUBLIC SERVICE ELECTRIC & GAS | PUGET SOUND POWER & LIGHT |
| SEATTLE CITY LIGHT | TENNESSEE VALLEY AUTHORITY |
| VERMONT ELECTRIC POWER CO. | VIRGINIA ELECTRIC & POWER CO. |
| WASSAIC DEVELOPMENT CENTER | WEST OREGON ELECTRIC CO-OP |
| WESTERN FARMERS ELEC. CO-OP | |