DIGITEN 1/2" Thread Male to 1/4"Tube Ball Valve Water Faucet Tap Feed RO Reverse Osmosis Tee union:1/2" Thread male x 1/2" thread female x 1/4" thread female.stainless steel. Tee thread male outer diameter: 19mm or 3/4". Ball valve:1/4" Thread male x 1/4 tube quick connect.copper material.