This John Guest 3/8 inch Single Check Valve allows water to pass only one way.
Ideal if you have a Rotary pump machine connected to Bottled Water. Allows you to disconnect bottled water supply but still retain water in the pump.
Otherwise pump will be sucking air when re-connected which can damage Rotary pumps.
Perfect for home users, caterers and other mobile locations that don't always have access to mains water.
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