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Brass Ball valve 1/2” ball valve with lock w/out handle Weight:180g USES: ►Used as a backflow preventer on wells and boiler systems. Its valve gate swings open, and when flow stops, the gate falls closed and prevents a reversal of the flow. Brass Ball valve 1/2” ball valve with lock w/out handle Weight:180g USES: ►Used as a backflow preventer on wells and boiler systems. Its valve gate swings open, and when flow stops, the gate falls closed and prevents a reversal of the flow.