Proline Series 1/2-in x 1/2-in Threaded Tee Fitting in the Brass Fittings department at Lowes.com
Amazon.com: (6 Pack) Cruzadel PVC Tee Fittings for Threaded Poultry Cups Chicken Waterer - Schedule 40 PVC 1/2 inch Slip X 1/2 inch Slip X 1/8 inch FPT : Patio, Lawn & Garden
Amazon.com: Pipe Tee 3/4 inch Female Thread Fittings Connector Brass NPT : Industrial & Scientific