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A water drain valve for use in cooperation with a fuel filter having a water separation capability includes a valve housing, a flow-control piston disposed within the valve housing, a first sealing grommet defining a water flow path into the valve housing, a second sealing grommet defining an air fl

A water drain valve for use in cooperation with a fuel filter having a water separation capability includes a valve housing, a flow-control piston disposed within the valve housing, a first sealing grommet defining a water flow path into the valve housing, a second sealing grommet defining an air flow path out of said valve housing and a spring-biased control lever assembled to the valve housing and cooperating with the flow-control piston so as to rotate the piston from a drain valve normally-closed condition to a drain valve normally-pen condition. The valve housing is a unitary casting having a sidewall defining first and second flow apertures, one of which receives the first sealing grommet and the other of which receives the second sealing grommet. The flow-control piston includes a first part-spherical portion which includes a water drain passageway therethrough leading to a drain opening which is defined by the valve housing. The flow-control piston also includes a second part-spherical portion defining an air flow passageway therethrough leading from the drain opening. In the normally-closed condition, the flow-control piston is turned such that the first part-spherical portion closes the flow communication between the water drain passageway and the water flow path. Concurrently, the second part-spherical portion closes the flow communication between the air flow passageway and the air flow path. In the opened condition, there is flow communication between the water drain passageway and the water flow path and between the air flow passageway and the air flow path for draining water from the fuel filter and providing vent air into the fuel filter.

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[ What is claimed is:] [1.]1. A water drain valve for use in cooperation with a fuel filter having a water separation capability, said water drain valve comprising:a valve housing having a sidewall defining a first flow aperture therethrough and a second flow aperture therethrough and further defini

[ What is claimed is:] [1.]1. A water drain valve for use in cooperation with a fuel filter having a water separation capability, said water drain valve comprising:a valve housing having a sidewall defining a first flow aperture therethrough and a second flow aperture therethrough and further defining a hollow interior extending into a drain opening;a flow-control piston positioned within said hollow interior and including a first portion defining a water drain passageway leading to said drain opening and a second portion defining an air flow passageway leading from said drain opening;a first sealing grommet assembled into said first flow aperture, said first sealing grommet having a sidewall defining a water flow path into said water drain valve and being constructed and arranged to sealingly engage said first portion;a second sealing grommet assembled into said second flow aperture, said second sealing grommet having a sidewall defining an air flow path out of said water drain valve and being constructed and arranged to sealingly engage said second portion; anda control lever assembled to said valve housing and being constructed and arranged to rotate said flow-control piston from a water drain valve normally-closed condition wherein flow communication between said water flow path and said water drain passageway is closed and flow communication between said air flow passageway and said air flow path is closed to a water drain valve open condition wherein said water drain passageway is aligned with and in flow communication with said water flow path and said air flow path is aligned with and in flow communication with said air flow passageway.