Gilmour 800214-5001 Y Connector - Dual shut-off valve.

Convert one faucet into two for multiple uses. Features full flow dual shut-off valve, the connector is made of durable metal construction that stands up to frequent uses and allows 45% more flow than standard valve, consequently, you can connect up to two accessories without decreasing water volume. Easy turn knob for quick on/off and swivel for tight and secure connection to faucet.