Watts - 3/4X3/4 LF7RU2-2 - 3/4" x 3/4" LF7RU2-U2 Lead Free Dual Check Valve 0072221 2719-20 What is this accessory used

What is this accessory used for

Lamp Included: G4 wafer lamp

Red Lion RL12G15-3W2V — 1

and other hardscape surfaces

The product specs list 12VAC operation

Watts - 3/4X3/4 LF7RU2-2 - 3/4" x 3/4" LF7RU2-U2 Lead Free Dual Check Valve 0072221 2719-20 What is this accessory used3 4 x 3 4 In Lead Free Residential Dual Check Valve Backflow Preventer, Union Female NPT Inlet x Union Female NPT Outlet Lead Free: YES This 3 4 by 3 4 inch lead free dual check valve backflow preventer helps prevent the reverse flow of polluted water from entering into the drinking water supply at the service entrance or at individual outlets. This valve consists of a lead free brass body construction, 3 4 inch union female NPT inlet by 3 4 union