SharkBite 3/4 in. x 1/2 in. x 3/4 in. Push-to-Connect Brass Reducing Tee Fitting U444LFA - The Home Depot
Proline Series 3/4-in x 3/4-in Barbed Tee Fitting in the Brass Fittings department at Lowes.com
Proline Series 1/2-in x 1/2-in Threaded Tee Fitting in the Brass Fittings department at Lowes.com
Anderson Metals - 38106-121208 38106 Red Brass Pipe Fitting, Reducing Tee, 3/4" x 3/4" x 1/2" Female Pipe: Industrial Pipe Fittings: Amazon.com: Tools & Home Improvement
3/4in × 1/2in PEX Fittings, 5 Pack/10 Pack PEX Reducing Elbow/Tee/Coupling, Brass Crimp for PEX Pipe in Plumbing Jobs (5pcs Straight, 3/4×1/2) - Amazon.com
Apollo 3/4 in. Brass PEX-A Barb x 3/4 in. CPVC Straight Adapter EPXCPVC34 - The Home Depot
Amazon.com: (Pack of 10) EFIELD 3/4 inch Pex Barb Crimp Fitting Mix: Tee(3 Pcs), Straight Coupling (3 Pcs), 90 Degree Elbow (4 Pcs) : Beauty & Personal Care