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check valve▼◼◼◼noun[UK: tʃek vælv] [US: ˈtʃek ˈvælv]
non-return valve [non-return valves]▼◼◼◻noun[UK: nɒn rɪ.ˈtɜːn vælv] [US: ˈnɑːn rə.ˈtɝːn ˈvælv]
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