1/2" Self-Priming, Pure Copper, Brass Nozzle/Fittings For Jiggle Siphon check Valve, 1 count, 2.70 Gallons Per Minute Flow rate, Multi-Purpose, Homebrewing , Wine Making 1/2" Nozzle/Fittings check valve. pure copper valve make of 19mm/0.75" outer Diameter pure copper tube, each contains a glass ball and #316 stainless steel spring to prevent the backflow of liquids. Fast flow rate of approx, 2.70 gallons per minute. connect this Valve with your own hose to create your own jiggle siphon hose pump. Great for farms, home, auto, shop, marine, and industrial applications, Perfect for homebrewing and wine making.