A fitting, designed for use in an underground storage system, that allows a valve or other component to be removed or repaired without the necessity of breaking concrete, digging down to the component, or cutting a hole in the tank.
Consider, for example, a float vent valve positioned at the top of an underground storage tank. The valve would probably be located 3 feet or so below grade level. If something went wrong with its operation–if, say, the ball inside the valve was sticking–getting to the valve to make repairs could be a difficult and expensive proposition. The presence of the valve in an extractor fitting, however, allows a technician to insert a special long-handled wrench, unscrew the fitting, and bring it to surface level for replacement or repair.
The extractor fitting itself is a type of bushing that screws into an opening at the top of a tank. A float vent valve or other device can be screwed into the center hole of the fitting. A bar extends across the top of the fitting, and this bar mates with the special long-handled wrench used by the tank technician. When the wrench is engaged with the extractor fitting, the extractor can be screwed out of the tank, bringing the connected float valve out with it.
An extractor fitting is generally supplied with a 4-inch diameter riser. This riser extends from the top of the tank to grade level, and thus allows convenient access to the extractor fitting below.