Raindrip 336STUB 1/2-Inch FPT by 1/4-Inch Barbed Tee Converts sprinkler risers to two 1/4" drip lines Inlet: 1/2" FPT, outlet: 1/4" barbed tee Screw onto an existing sprinkler riser pipe and attach 1/4" tubing to convert to drip irrigation