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This aluminum discriminator valve installs in your vent line, eliminating the need for a catch can to trap overflow while refueling. A float valve closes the vent line if the line fills with fuel. A separate gravity valve closes the vent line in the event of a rollover. 12AN male fittings on each end for easy installation.
Note: Discriminator valves only close if the car is upside-down, or if the vent hose is completely full of fuel. They are not designed to prevent small amounts of fuel from sloshing out.